Unit 10 课时4 Theme Reading（分层作业）英语新教材仁爱科普版八年级下册

Unit 10 World in the Cloud! 课时4 Theme Reading 分层作业 参考答案 一、单项选择题。 1. A 2. B 3. A 4. A 5. C 二、根据汉语提示完成句子。 1. make good use of 2. protect personal information 3. take a picture of 4. harmful 5. Click 三、信息匹配。 Dos (应该做的): 1. A 2. D 3. E Don'ts (不应该做的): 4. B 5. C 6. F 四、用所给词的适当形式填空。 1. personal 2. online 3. risk 4. harmful 5. Click 五、补全对话（5选5）。 1. C 2. A 3. E 4. B 5. D 六、完形填空。 1. A 2. C 3. B 4. B 5. D 6. A 7. A 8. B 9. A 10. C 七、阅读理解。 1. A 2. B 3. C 4. C 5. B 八、多任务混合阅读。 Task 1：回答问题。 1. Because some people may use it to hurt you. 2. Think carefully / Think before you post. Task 2：完成表格。 1. private 2. strangers 3. Think 4. Limit 5. uncomfortable Task 3: 写作训练（示例答案）。 Nowadays, the internet is very important in our life. But we must use it wisely to stay safe. First, we should never share personal information like our password or address with strangers. Second, we need to limit our screen time because too much time online is harmful to our health. Third, before we click a link, we should double-check it to make sure it is safe. Fourth, if we receive a bad message, we should not reply but keep a record and tell our parents. Finally, by using the internet wisely, we can make the most of it and enjoy its benefits. Let's be careful and stay safe online! 1 / 6 学科网（北京）股份有限公司 学科网（北京）股份有限公司 $ Unit 10 World in the Cloud! 课时4 Theme Reading 分层作业 核心知识速记 01基础达标 02能力提升 03拓展培优 04思维进阶 词汇 risk n. 风险；危险 password n. 密码 address n. 地址；网址 link n. 链接 click v. 点击，单击 reply v., n. 答复；回答 app n. 应用软件 短语 look up 查阅 make good use of 充分利用 spend time online 花时间上网 screen time 屏幕使用时间 take a break 休息一下 protect personal information 保护个人信息 share... with... 与……分享…… double-check 仔细检查；再次确认 reply to 回复 keep a record 记录 report to 报告给 make the most of 充分利用 stay healthy and safe 保持健康和安全 句型 1. How can we stay healthy and safe while making good use of the internet? 我们如何在充分利用互联网的同时保持健康和安全？ 2. First, use the internet to learn new skills and look up useful information. 首先，使用互联网学习新技能和查找有用信息。 3. Second, do not spend too much time online. 第二，不要花太多时间上网。 4. Third, protect your personal information. 第三，保护你的个人信息。 5. Finally, problems may also come from people around you. 最后，问题也可能来自你周围的人。 6. If you get a bad message from someone, do not reply. 如果你收到某人的不良信息，不要回复。 7. By using it wisely, we can make the most of it and stay healthy and safe. 通过明智地使用它，我们可以充分利用它并保持健康和安全。 一、单项选择题。 （ ）1. To stay safe online, you should never ______ your password with strangers. A. share B. tell C. talk D. speak （ ）2. If you receive a bad message, do not ______ it. Just keep a record. A. reply B. reply to C. answer to D. respond （ ）3. Too much ______ time is harmful to your eyes. A. screen B. screens C. the screen D. a screen （ ）4. Before you click a link, you should ______ it to make sure it's safe. A. double-check B. check double C. double check D. double checking （ ）5. By ______ the internet wisely, we can make the most of it. A. use B. used C. using D. to use 二、根据汉语提示完成句子。 1. You should ______ ______ ______ ______（充分利用）the internet to learn new things. 2. It's important to ______ ______ ______（保护个人信息）online. 3. If you get a bad message, don't reply. Just ______ ______ ______（拍照）the screen. 4. Too much screen time is ______（有害的）to your health. 5. ______（点击）the link and you can read the book online. 三、信息匹配。 根据课文内容，将下列建议与对应的类别匹配（只填字母序号）。 A. Use the internet to learn new skills. B. Spend too much time online. C. Share your password with strangers. D. Make a plan for your time online. E. Double-check links before clicking. F. Reply to bad messages from others. Dos (应该做的) Don'ts (不应该做的) 1. ______ 2. ______ 3. ______ 4. ______ 5. ______ 6. ______ 四、用所给词的适当形式填空。 1. Xuanyuan is very careful with her ______ (person) information on social media. 2. Social media are ______ (online) communication apps or websites. 3. If you share your address online, you will have a high ______ (risky) of putting yourself in danger. 4. Too much screen time is ______ (harm). 5. ______ (click) the link and you can read the book on your computer. 五、补全对话（5选5）。 A: Mom, I want to play computer games for a while. B: OK, but remember not to spend too much time online. 1. ______ A: I know. Too much screen time is bad for my eyes. B: And be careful about what you do online. 2. ______ A: Sure. I only visit safe websites. B: Also, never share your personal information with strangers. 3. ______ A: I won't. I know it's dangerous. B: If you receive a bad message from someone, what will you do? A: 4. ______ And I'll tell you or my teacher. B: Good. 5. ______ A: Thanks, Mom. I'll be careful. A. Double-check links before you click them. B. I won't reply to it and will keep a record. C. Set a time limit and take a break on time. D. The internet is a wonderful place if used wisely. E. They might steal your password or address. 六、完形填空。 Nowadays, almost everyone uses the internet. It helps us do many things, but it also brings some 1. ______. So it's important to learn how to use it 2. ______. First, use the internet to learn. You can 3. ______ new skills and find useful information. But remember to 4. ______ a plan for your time online. Don't spend too much time on it, because too much screen time is 5. ______ to your health. Second, protect your personal information. Never 6. ______ your password, address, or phone number with strangers online. Before you 7. ______ a link, make sure it is safe. Third, be careful about messages from others. If you get a bad message, do not 8. ______ it. Instead, take a picture of the screen and keep a 9. ______. If it happens again, report it to your parents or teachers. The internet is a great tool. By using it wisely, we can 10. ______ the most of it and stay safe. （ ）1. A. risks B. advantages C. fun D. news （ ）2. A. slowly B. quickly C. wisely D. quietly （ ）3. A. look for B. look up C. look after D. look at （ ）4. A. do B. make C. have D. take （ ）5. A. good B. helpful C. useful D. harmful （ ）6. A. share B. give C. send D. tell （ ）7. A. click B. open C. visit D. check （ ）8. A. reply B. reply to C. answer D. ask （ ）9. A. record B. diary C. note D. copy （ ）10. A. get B. take C. make D. do 七、阅读理解。 Tips for Safe Internet Use The internet is a great place to learn, play, and connect with friends. But it's important to stay safe online. Here are some tips from experts. First, be careful with your personal information. Never give out your real name, address, phone number, or password to anyone online. Some people may use this information to hurt you. Second, think before you click. Some links or ads may take you to dangerous websites. They might try to steal your information or put viruses on your computer. If you are not sure about a link, don't click it. Third, limit your screen time. Spending too much time online can be bad for your eyes and health. It can also stop you from doing other important things like homework and exercise. Set a timer and take breaks every 30 minutes. Fourth, be kind to others online. Never send mean messages or share embarrassing photos of others. Treat people the way you want to be treated. Finally, if something makes you feel uncomfortable online, tell a parent or teacher. They can help you deal with the problem. Remember, staying safe online is your responsibility. （ ）1. What should you NOT do according to the first tip? A. Give out your real name. B. Use a password. C. Protect your information. D. Be careful online. （ ）2. Why should you think before you click a link? A. Because links are always dangerous. B. Because some links may lead to harmful websites. C. Because clicking links costs money. D. Because links are not useful. （ ）3. What is the third tip about? A. Protecting personal information. B. Being kind online. C. Limiting screen time. D. Asking for help. （ ）4. What should you do if you feel uncomfortable online? A. Keep it to yourself. B. Reply to bad messages. C. Tell a parent or teacher. D. Click more links. （ ）5. What is the main idea of the passage? A. The internet is dangerous. B. How to stay safe online. C. Why we should use the internet. D. The importance of screen time. 八、多任务混合阅读:阅读短文，完成任务。 Nowadays, many students spend a lot of time on the internet. They play games, watch videos, and chat with friends. The internet is fun and useful, but it can also be dangerous if we are not careful. Here are some rules to help you stay safe online. Rule 1: Keep your personal information private. Do not tell anyone your real name, address, phone number, or password. Some people may use it to hurt you. Rule 2: Be careful with strangers online. Never meet someone you only know online without telling your parents. They may not be who they say they are. Rule 3: Think before you post. Once you put something online, it is there forever. Even if you delete it, someone may have already saved it. So be careful about what you share. Rule 4: Limit your time online. Too much screen time is bad for your eyes and health. It can also make you tired and affect your study. Set a time limit and take breaks. Rule 5: If you see something bad or feel uncomfortable, tell an adult you trust. They can help you. Remember, the internet is a wonderful tool. If you use it wisely, you can have fun and learn a lot. Stay safe! Task 1: 回答问题。 1. Why should we keep personal information private? _________________________________________________ 2.. What should you do before you post something online? _________________________________________________ Task 2: 根据短文内容，完成下面的表格（每空不超过3词）。 Rules for Safe Internet Use 1. Keep personal information ______. 2. Be careful with ______ online. 3. ______ before you post. 4. ______ your time online. 5. Tell an adult if you feel ______. Task 3: 写作训练。 根据短文内容及你的理解，写一段关于“如何安全上网”的短文，要求： 1. 不少于6句话； 2. 包含至少3条建议； 3. 运用本课时所学词汇和句型。 _____________________________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ 1 / 6 学科网（北京）股份有限公司 学科网（北京）股份有限公司 $ Unit 10 World in the Cloud! 课时4 Theme Reading 分层作业 核心知识速记 01基础达标 02能力提升 03拓展培优 04思维进阶 词汇 risk n. 风险；危险 password n. 密码 address n. 地址；网址 link n. 链接 click v. 点击，单击 reply v., n. 答复；回答 app n. 应用软件 短语 look up 查阅 make good use of 充分利用 spend time online 花时间上网 screen time 屏幕使用时间 take a break 休息一下 protect personal information 保护个人信息 share... with... 与……分享…… double-check 仔细检查；再次确认 reply to 回复 keep a record 记录 report to 报告给 make the most of 充分利用 stay healthy and safe 保持健康和安全 句型 1. How can we stay healthy and safe while making good use of the internet? 我们如何在充分利用互联网的同时保持健康和安全？ 2. First, use the internet to learn new skills and look up useful information. 首先，使用互联网学习新技能和查找有用信息。 3. Second, do not spend too much time online. 第二，不要花太多时间上网。 4. Third, protect your personal information. 第三，保护你的个人信息。 5. Finally, problems may also come from people around you. 最后，问题也可能来自你周围的人。 6. If you get a bad message from someone, do not reply. 如果你收到某人的不良信息，不要回复。 7. By using it wisely, we can make the most of it and stay healthy and safe. 通过明智地使用它，我们可以充分利用它并保持健康和安全。 一、单项选择题。 （ ）1. To stay safe online, you should never ______ your password with strangers. A. share B. tell C. talk D. speak 【答案】A 【解析】本题考查动词辨析。share...with...是固定搭配，意为“与……分享……”，符合“不要与陌生人分享密码”的语境；tell（告诉）通常说tell sb. sth.；talk（交谈）和speak（说）不与password搭配，故选A。 （ ）2. If you receive a bad message, do not ______ it. Just keep a record. A. reply B. reply to C. answer to D. respond 【答案】B 【解析】本题考查动词短语。reply to是固定短语，意为“回复”，后接回复的对象或内容；此处指不要回复不良信息，应用reply to it；answer可直接接宾语，但answer to意为“对……负责”，不符合；respond常接to，但选项中没有，故选B。 （ ）3. Too much ______ time is harmful to your eyes. A. screen B. screens C. the screen D. a screen 【答案】A 【解析】本题考查名词作定语。screen time是固定短语，意为“屏幕使用时间”，screen在此作定语修饰time，用单数形式，故选A。 （ ）4. Before you click a link, you should ______ it to make sure it's safe. A. double-check B. check double C. double check D. double checking 【答案】A 【解析】本题考查复合动词。double-check是合成词，意为“仔细检查；再次确认”，should后接动词原形，故选A。 （ ）5. By ______ the internet wisely, we can make the most of it. A. use B. used C. using D. to use 【答案】C 【解析】本题考查介词后接动名词。by是介词，后接动词-ing形式，故选C。 二、根据汉语提示完成句子。 1. You should ______ ______ ______ ______（充分利用）the internet to learn new things. 【答案】make good use of 【解析】本题考查短语make good use of，意为“充分利用”，与课文原句一致。 2. It's important to ______ ______ ______（保护个人信息）online. 【答案】protect personal information 【解析】本题考查短语protect personal information，意为“保护个人信息”。 3. If you get a bad message, don't reply. Just ______ ______ ______（拍照）the screen. 【答案】take a picture of 【解析】本题考查短语take a picture of，意为“拍照”，课文原句是“Take a picture of the screen”。 4. Too much screen time is ______（有害的）to your health. 【答案】harmful 【解析】本题考查形容词harmful，be harmful to意为“对……有害”。 5. ______（点击）the link and you can read the book online. 【答案】Click 【解析】本题考查动词click，祈使句用动词原形。 三、信息匹配。 根据课文内容，将下列建议与对应的类别匹配（只填字母序号）。 A. Use the internet to learn new skills. B. Spend too much time online. C. Share your password with strangers. D. Make a plan for your time online. E. Double-check links before clicking. F. Reply to bad messages from others. Dos (应该做的) Don'ts (不应该做的) 1. ______ 2. ______ 3. ______ 4. ______ 5. ______ 6. ______ 【答案】1.A、2.D、3.E；4.B, 5.C, 6.F 【解析】根据课文建议：应该做的有：用互联网学习新技能(A)、制定时间计划(D)、检查链接(E)、记录并报告不良信息(G)、按时休息(H)；不应该做的有：花太多时间(B)、分享密码(C)、回复不良信息(F)。本题要求各选3项，合理即可。 四、用所给词的适当形式填空。 1. Xuanyuan is very careful with her ______ (person) information on social media. 【答案】personal 【解析】本题考查形容词作定语。person是名词，其形容词形式为personal，修饰information，意为“个人的信息”。 2. Social media are ______ (online) communication apps or websites. 【答案】online 【解析】本题考查形容词作定语。online既可作副词也可作形容词，此处修饰communication，应用形容词，意为“在线的”。 3. If you share your address online, you will have a high ______ (risky) of putting yourself in danger. 【答案】risk 【解析】本题考查名词。a high risk of意为“……的高风险”，risk是名词，risky是形容词，此处需要名词。 4. Too much screen time is ______ (harm). 【答案】harmful 【解析】本题考查形容词。be harmful to是固定搭配，意为“对……有害”，harm的形容词是harmful。 5. ______ (click) the link and you can read the book on your computer. 【答案】Click 【解析】本题考查祈使句。祈使句以动词原形开头，click意为“点击”。 五、补全对话（5选5）。 A: Mom, I want to play computer games for a while. B: OK, but remember not to spend too much time online. 1. ______ A: I know. Too much screen time is bad for my eyes. B: And be careful about what you do online. 2. ______ A: Sure. I only visit safe websites. B: Also, never share your personal information with strangers. 3. ______ A: I won't. I know it's dangerous. B: If you receive a bad message from someone, what will you do? A: 4. ______ And I'll tell you or my teacher. B: Good. 5. ______ A: Thanks, Mom. I'll be careful. A. Double-check links before you click them. B. I won't reply to it and will keep a record. C. Set a time limit and take a break on time. D. The internet is a wonderful place if used wisely. E. They might steal your password or address. 【答案】1. C 2. A 3. E 4. B 5. D 【解析】 1. 上文提到不要花太多时间上网，妈妈补充建议设定时间限制并按时休息，选项C（设定时间限制并按时休息）符合。 2. 上文说小心网上做的事，下文说只访问安全网站，中间应是提醒检查链接，选项A（点击前仔细检查链接）符合。 3. 上文说不要与陌生人分享个人信息，选项E（他们可能偷你的密码或地址）解释了原因，符合。 4. 上文问收到不良信息怎么办，选项B（我不回复并记录）是正确做法。 5. 最后妈妈总结，选项D（如果明智使用，互联网是个好地方）作为鼓励和总结，符合语境。 六、完形填空。 Nowadays, almost everyone uses the internet. It helps us do many things, but it also brings some 1. ______. So it's important to learn how to use it 2. ______. First, use the internet to learn. You can 3. ______ new skills and find useful information. But remember to 4. ______ a plan for your time online. Don't spend too much time on it, because too much screen time is 5. ______ to your health. Second, protect your personal information. Never 6. ______ your password, address, or phone number with strangers online. Before you 7. ______ a link, make sure it is safe. Third, be careful about messages from others. If you get a bad message, do not 8. ______ it. Instead, take a picture of the screen and keep a 9. ______. If it happens again, report it to your parents or teachers. The internet is a great tool. By using it wisely, we can 10. ______ the most of it and stay safe. （ ）1. A. risks B. advantages C. fun D. news （ ）2. A. slowly B. quickly C. wisely D. quietly （ ）3. A. look for B. look up C. look after D. look at （ ）4. A. do B. make C. have D. take （ ）5. A. good B. helpful C. useful D. harmful （ ）6. A. share B. give C. send D. tell （ ）7. A. click B. open C. visit D. check （ ）8. A. reply B. reply to C. answer D. ask （ ）9. A. record B. diary C. note D. copy （ ）10. A. get B. take C. make D. do 【答案】1. A 2. C 3. B 4. B 5. D 6. A 7. A 8. B 9. A 10. C 【解析】 1. A。考查名词辨析。句意：它帮助我们做很多事，但也带来一些风险。根据上下文，互联网有优点也有风险，risks（风险）符合语境；advantages（优点）与but转折矛盾；fun（乐趣）、news（新闻）不贴切。 2. C。考查副词辨析。句意：所以学会如何明智地使用它很重要。wisely（明智地）符合全文主题；slowly（慢地）、quickly（快地）、quietly（安静地）均不贴切。 3. B。考查动词短语辨析。句意：你可以查阅新技能和有用信息。look up（查阅）符合；look for（寻找）、look after（照顾）、look at（看）均不准确。 4. B。考查动词搭配。句意：但记得为上网时间制定计划。make a plan是固定搭配，意为“制定计划”。 5. D。考查形容词辨析。句意：因为太多屏幕时间对健康有害。harmful（有害的）符合；good（好的）、helpful（有帮助的）、useful（有用的）均与句意相反。 6. A。考查动词辨析。句意：永远不要与陌生人分享密码、地址或电话号码。share...with...是固定搭配，意为“与……分享”。 7. A。考查动词辨析。句意：在你点击链接之前，确保它安全。click a link（点击链接）是常用搭配；open（打开）、visit（访问）、check（检查）均不准确。 8. B。考查动词短语辨析。句意：如果你收到不良信息，不要回复。reply to（回复）符合；answer可接宾语，但answer to意为“对……负责”；ask（问）不符合。 9. A。考查名词辨析。句意：给屏幕拍照并保存记录。keep a record（保存记录）是固定短语；diary（日记）、note（笔记）、copy（副本）均不贴切。 10. C。考查动词短语辨析。句意：通过明智地使用它，我们可以充分利用它并保持安全。make the most of是固定短语，意为“充分利用”。 七、阅读理解。 Tips for Safe Internet Use The internet is a great place to learn, play, and connect with friends. But it's important to stay safe online. Here are some tips from experts. First, be careful with your personal information. Never give out your real name, address, phone number, or password to anyone online. Some people may use this information to hurt you. Second, think before you click. Some links or ads may take you to dangerous websites. They might try to steal your information or put viruses on your computer. If you are not sure about a link, don't click it. Third, limit your screen time. Spending too much time online can be bad for your eyes and health. It can also stop you from doing other important things like homework and exercise. Set a timer and take breaks every 30 minutes. Fourth, be kind to others online. Never send mean messages or share embarrassing photos of others. Treat people the way you want to be treated. Finally, if something makes you feel uncomfortable online, tell a parent or teacher. They can help you deal with the problem. Remember, staying safe online is your responsibility. （ ）1. What should you NOT do according to the first tip? A. Give out your real name. B. Use a password. C. Protect your information. D. Be careful online. 【答案】A 【解析】细节理解题。根据第一段“Never give out your real name, address, phone number, or password”可知，不要泄露真实姓名，故选A。 （ ）2. Why should you think before you click a link? A. Because links are always dangerous. B. Because some links may lead to harmful websites. C. Because clicking links costs money. D. Because links are not useful. 【答案】B 【解析】细节理解题。根据第二段“Some links or ads may take you to dangerous websites”可知，点击前要思考是因为有些链接可能导向危险网站，故选B。 （ ）3. What is the third tip about? A. Protecting personal information. B. Being kind online. C. Limiting screen time. D. Asking for help. 【答案】C 【解析】主旨大意题。第三段主要讲限制屏幕时间，故选C。 （ ）4. What should you do if you feel uncomfortable online? A. Keep it to yourself. B. Reply to bad messages. C. Tell a parent or teacher. D. Click more links. 【答案】C 【解析】细节理解题。根据最后一段“if something makes you feel uncomfortable online, tell a parent or teacher”可知，应告诉父母或老师，故选C。 （ ）5. What is the main idea of the passage? A. The internet is dangerous. B. How to stay safe online. C. Why we should use the internet. D. The importance of screen time. 【答案】B 【解析】主旨大意题。全文介绍了几条安全上网的建议，因此主要讲如何安全上网，故选B。 八、多任务混合阅读:阅读短文，完成任务。 Nowadays, many students spend a lot of time on the internet. They play games, watch videos, and chat with friends. The internet is fun and useful, but it can also be dangerous if we are not careful. Here are some rules to help you stay safe online. Rule 1: Keep your personal information private. Do not tell anyone your real name, address, phone number, or password. Some people may use it to hurt you. Rule 2: Be careful with strangers online. Never meet someone you only know online without telling your parents. They may not be who they say they are. Rule 3: Think before you post. Once you put something online, it is there forever. Even if you delete it, someone may have already saved it. So be careful about what you share. Rule 4: Limit your time online. Too much screen time is bad for your eyes and health. It can also make you tired and affect your study. Set a time limit and take breaks. Rule 5: If you see something bad or feel uncomfortable, tell an adult you trust. They can help you. Remember, the internet is a wonderful tool. If you use it wisely, you can have fun and learn a lot. Stay safe! Task 1: 回答问题。 1. Why should we keep personal information private? _________________________________________________ 【答案】Because some people may use it to hurt you. 【解析】细节理解题。根据Rule 1最后一句“Some people may use it to hurt you”可知答案。 2.. What should you do before you post something online? _________________________________________________ 【答案】Think carefully / Think before you post. 【解析】细节理解题。根据Rule 3第一句“Think before you post”可知答案。 Task 2: 根据短文内容，完成下面的表格（每空不超过3词）。 Rules for Safe Internet Use 1. Keep personal information ______. 2. Be careful with ______ online. 3. ______ before you post. 4. ______ your time online. 5. Tell an adult if you feel ______. 【答案】1. private 2. strangers 3. Think 4. Limit 5. uncomfortable 【解析】考查细节提取。从文中各规则中提取关键词即可。 Task 3: 写作训练。 根据短文内容及你的理解，写一段关于“如何安全上网”的短文，要求： 1. 不少于6句话； 2. 包含至少3条建议； 3. 运用本课时所学词汇和句型。 _____________________________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ 【答案】（示例） Nowadays, the internet is very important in our life. But we must use it wisely to stay safe. First, we should never share personal information like our password or address with strangers. Second, we need to limit our screen time because too much time online is harmful to our health. Third, before we click a link, we should double-check it to make sure it is safe. Fourth, if we receive a bad message, we should not reply but keep a record and tell our parents. Finally, by using the internet wisely, we can make the most of it and enjoy its benefits. Let's be careful and stay safe online! 【解析】示例紧扣要求：共7句话，包含4条建议（不分享个人信息、限制屏幕时间、检查链接、处理不良信息），运用了本课词汇（share, personal information, password, address, screen time, harmful, click, double-check, reply, keep a record, make the most of）和句型（we should..., it is harmful to..., if..., by using...）。 1 / 6 学科网（北京）股份有限公司 学科网（北京）股份有限公司 $