Unit7知识点-Cross-curricular connection练习2025-2026学年沪教版八年级英语下册

八年级英语下册Unit7知识点-Cross-curricular connection练习 小试牛刀 A. 用括号内动词的正确形式填空（一般现在时或被动语态） 1. BDS __________ (be) one of the global navigation satellite systems. 2. BDS __________ (be) a group of satellites in orbit around the Earth. 3. Each satellite __________ (send) radio signals to the Earth with information. 4. The signals __________ (answer) two important questions: “Where in space is the satellite?” and “When did the signal leave the satellite?” 5. The radio signal __________ (travel) through space at the speed of light. 6. Your phone __________ (receive) the signal and __________ (compare) it to the exact time of arrival. 7. The phone then __________ (calculate) how far it is from the satellite. 8. Your phone __________ (need) information from four satellites to calculate your location. 9. When we use a BDS device, we __________ (will) not get lost. 10. If your phone __________ (support) BDS, it will automatically pick the best signal. B. 用 can, need to, will 填空 1. Each satellite __________ send radio signals to Earth. 2. Your phone __________ receive the signal and calculate the distance. 3. Your phone __________ information from four satellites to calculate your location. 4. When we use BDS, we __________ not get lost. 5. You __________ use BDS outside China, but accuracy is higher in China. 6. If your phone supports BDS, it __________ automatically pick the best signal. C. 用 if, when, because 填空 1. __________ your phone supports BDS, it will pick the best signal. 2. __________ we use a BDS device, we won’t get lost. 3. Your phone needs four satellites __________ one satellite is not enough. 4. __________ you are in an area without mobile network, you can send text messages through BDS. 5. BDS is useful __________ it helps us find our location. 配套练习 A. 单项选择（★） 从A、B、C、D中选择最佳答案。 1. “BDS is a group of satellites in orbit.” 这句话使用的时态是： A. 一般过去时 B. 一般现在时 C. 一般将来时 D. 现在进行时 2. “Radio signals are sent by satellites.” 这句话使用的语态是： A. 主动语态 B. 被动语态 C. 一般将来时 D. 现在完成时 3. “Your phone needs information from four satellites.” 中的 “needs” 表示： A. 需要 B. 可能 C. 必须 D. 想要 4. “If your phone supports BDS, it will pick the best signal.” 中的 “if” 引导的是： A. 时间状语从句 B. 条件状语从句 C. 原因状语从句 D. 结果状语从句 5. 下列句子中，被动语态使用正确的是： A. Two-way communication can use by BDS. B. Two-way communication can be used by BDS. C. Two-way communication is use by BDS. D. Two-way communication used by BDS. B. 完成句子（★★） 根据文章内容和语法提示，用正确的动词形式、情态动词、被动语态或连词完成句子。 1. 北斗卫星导航系统是全球导航卫星系统之一。 BDS is one of the global __________ satellite systems. 2. 每颗卫星向地球发送带有信息的无线电信号。 Each satellite __________ radio signals to the Earth with information. 3. 你的手机接收信号并将其与到达的确切时间进行比较。 Your phone __________ the signal and __________ it to the exact time of arrival. 4. 当使用北斗设备时，我们不会迷路。 __________ we use a BDS device, we won’t get lost. 5. 在没有移动网络的地区，人们可以通过北斗卫星发送短信。 In areas without any mobile network, people __________ send text messages through BeiDou satellites. C. 补全对话（★★★） 根据文章内容和语法知识，从方框中选择合适的句子完成对话。 A. It sends radio signals to Earth. B. Your phone needs four satellites to calculate your location. C. If your phone supports BDS, it will pick the best signal. D. Yes, but its accuracy is higher in China. Tom: How does a BDS satellite work? Lucy: (1) __________ Tom: How many satellites does your phone need? Lucy: (2) __________ Tom: How does my phone choose which signal to use? Lucy: (3) __________ Tom: Can I use BDS outside China? Lucy: (4) __________ D. 拓展思考（★★★） 请根据要求完成以下任务。 Part 1（描述BDS的功能） 用一般现在时写三句话，介绍北斗卫星导航系统的作用。 1. ____________________________________________________________ 2. ____________________________________________________________ 3. ____________________________________________________________ Part 2（使用条件状语从句） 用 if 写两个句子，说明在什么情况下北斗系统特别有用。 4. ____________________________________________________________ 5. ____________________________________________________________ Part 3（综合） 写一段话（至少5句）介绍北斗卫星导航系统的工作原理。说明卫星如何发送信号、手机如何计算位置、以及它的特殊功能（如双向通信）。使用一般现在时、至少一个被动语态和一个条件状语从句。 ____________________________________________________________ ____________________________________________________________ ____________________________________________________________ ____________________________________________________________ ____________________________________________________________ 参考答案与解析 小试牛刀 A 1. is 2. is 3. sends 4. answer 5. travels 6. receives, compares 7. calculates 8. needs 9. will 10. supports 小试牛刀 B 1. can 2. can 3. needs 4. will 5. can 6. will 小试牛刀 C 1. If 2. When 3. because 4. If 5. because 配套练习 A 1. B 2. B 3. A 4. B 5. B 配套练习 B 1. navigation 2. sends 3. receives, compares 4. When 5. can 配套练习 C 1. A 2. B 3. C 4. D 配套练习 D（参考示例） 1. BDS helps us find our location anywhere on Earth. 2. It can also be used for two-way communication without mobile networks. 3. Many devices, such as phones and cars, use BDS automatically. 4. If you are in a remote area without phone signal, BDS can help you send messages. 5. If you are driving, BDS will guide you to your destination. 6. BDS is a global navigation satellite system. Satellites in orbit send radio signals to Earth. Your phone receives these signals and calculates how far it is from each satellite. One satellite is not enough, so your phone needs four satellites to find your exact location. If your phone supports BDS, it will automatically pick the best signal. BDS also allows two-way communication. In areas without mobile networks, people can send text messages through BeiDou satellites. This makes BDS very useful for hikers, sailors and people in remote places. 1 学科网（北京）股份有限公司 $