Unit 4 School Days 语法Grammar 时间介词at on in和频度副词 2026-2027学年七年级英语上册（译林版）

学校:___________姓名：___________班级：___________考号：___________ Unit 4 School Days 时间介词at on in和频度副词 （时间：60分钟，满分：100分） 频度副词 频度副词 含义 频率程度 示例句子 always 总是 100% She always drinks coffee in the morning. usually 通常 90% I usually walk to work. often 经常 70% They often play football after school. sometimes 有时 50% He sometimes forgets his keys. occasionally 偶尔 30% We occasionally eat out. seldom 很少 10% She seldom watches TV. rarely 极少 5% He rarely gets angry. never 从不 0% I never eat fast food. 时间介词 介词 用法 示例 on 用在表示具体的日期、星期几、特定的节日(一天)、具体某一天的上午、下午或晚上前。 on October 1st on Friday on Children’s Day on Monday morning in 用于年、季节、月份前,也可以泛指在上午、下午或晚上。 in 2020 in winter in March in the afternoon at 用于表示具体时刻、年龄或noon、 night等前。 at 8:00 at six(years old)/at the age of six at noon 单项选择(本大题共50小题，每小题2分，共100分) 1．—Do you often do exercise to keep fit, Jackson? —No, ________. I don’t like sports at all. A．always B．usually C．often D．never 2．Linda studies ________ for her exam, but she ________ makes progress. A．hard, hardly B．hardly, hard C．hardly, hardly 3．My classmate Li Tao is _______ full of energy because he plays basketball every afternoon. A．never B．sometimes C．seldom D．always 4．—Why does your father ________ go to work by car? —Because he thinks walking is good for health. A．sometimes B．always C．seldom D．usually 5．It’s bad for us to drink too much coffee, so I ________ drink it. A．seldom B．often C．always D．sometimes 6．People ________ feed pigeons in the community park every morning. A．never B．often C．seldom D．hardly 7．—I hate vegetables. I ________ eat them. —But they’re good for your health! You should eat them. A．seldom B．often C．usually 8．—What’s your mother’s lifestyle? —She ________ stays up late and always gets up early. A．often B．usually C．never D．sometimes 9．We ________ have a big dinner on New Year’s Eve. It’s our tradition. A．never B．seldom C．sometimes D．always 10．My father ________ plays soccer with me because he is very busy. A．always B．often C．usually D．seldom 11．I ________ walk to school. I always take the school bus. A．often B．sometimes C．never 12．I like skateboarding. I ________ practise it at the park with my friends. A．never B．often C．hardly ever 13．Tony is busy with his study, so he ________ hangs out with friends on school days. A．often B．usually C．hardly ever D．always 14．—The weather is getting hot. Do you go swimming with your parents? —Not very often. We go ________. A．always B．sometimes C．usually 15．I ________ tried a salty zongzi before, so this year I will try one. A．always B．often C．never D．sometimes 16．My brother ________ plays basketball on weekends. He likes it very much. A．never B．seldom C．always D．sometimes 17．Tom lives far away from school. But he is ________ late for school. A．sometimes B．often C．never D．usually 18．—Do you often have hamburgers? —I ________ have hamburgers. I dislike them. A．often B．never C．usually D．always 19．My dad ________ makes kites because he is not good at handwork. A．always B．usually C．often D．seldom 20．I don’t have much time to play ball games. I ________ play ball games. A．never B．seldom C．always D．sometimes 21．—I notice you hardly ever eat fast food. Is that true? —Well, I ________ go to KFC because it’s unhealthy. A．sometimes B．always C．usually D．seldom 22．My grandfather is in good health. He ________ eats fast food. A．often B．usually C．seldom D．always 23．—Do you often do chores at home? —No, I ________ do but I plan to change because I don’t want to depend on my parents. A．always B．often C．usually D．seldom 24．DeepSeek is so powerful that it can ________ give answers to your questions. A．always B．never C．seldom D．sometimes 25．My father ________ watches TV. He thinks watching TV is a waste (浪费) of time. A．often B．seldom C．always D．usually 26．Most schools in China begin their autumn term ________ September 1st. Do you know why? A．in B．at C．on D．of 27．Do you read your favourite books ________ April 23rd? It is World Book Day. A．for B．at C．on 28．I get up ________ 6:00 ________ the morning. A．at; in B．in; at C．on; in D．at; on 29．Ice skating is the most common sport ________ winter. A．in B．at C．of D．for 30．We usually get a lot of nice gifts ________ Children’s Day. A．on B．at C．/ D．in 31．My family always have a party ________ the evening of October 31st, and the party usually starts ________ 8:00 p.m. A．at; at B．on; on C．at; on D．on; at 32．Tom usually goes to bed ________ nine. A．from B．at C．in D．on 33．—What time do you go to school in the morning, Sally? —________ 7:50. A．On B．In C．At D．For 34．She takes a shower ________ 7:00 ________ the evening. A．in; in B．at; on C．at; in 35．I go to the Science Club ________ Tuesdays and Fridays. A．in B．at C．on D．for 36．My birthday is ________ June 8th, and it is ________ summer. A．on; in B．in; on C．at; in D．on; at 37．We start lessons ________ eight o’clock ________ Monday morning. A．at;in B．on;in C．at;on D．on;at 38．School finishes ________ 4:30 p.m. ________ weekdays. A．in; on B．at; on C．at; in D．on; at 39．My teacher runs ________ the morning. But he doesn’t run ________ Sunday mornings. A．in; on B．on; in C．in; in 40．—What do you have ________ Monday? —We have Chinese, math and English. A．in B．on C．at D．for 41．We have lunch ________ twelve o’clock at school. A．in B．on C．at D．for 42．—What time do you usually get up? —________ 6:45 in the morning. A．In B．On C．At D．For 43．—What’s your school trip to Hongshan Zoo like? —Amazing! We leave early ________ the morning and the trip lasts the whole day. A．on B．in C．at D．for 44．We have geography ________ Monday morning. A．in B．on C．at D．for 45．—Why are you often late for school? —Sorry, Mr Li. It’s very hard for me to get up ________ a cold winter morning. A．in B．on C．at D．of 46．Our school has ________ Open Day ________ every October. Parents can come and watch lessons on that day. A．an; in B．a; / C．the; in D．an; / 47．They often go climbing ________ sunny days and come back ________ the afternoon. A．on；on B．in；in C．on；in D．in；on 48．He was born ________ May 5th, 2012, and his first birthday was ________ a rainy day. A．in; on B．on; on C．on; in D．in; in 49．I have Biology classes ________ Friday morning. They begin at 8:30. A．in B．at C．on D．for 50．We have Chinese ________ Monday and Friday. A．in B．at C．on D．for 试卷第1页（共3页） 试卷第1页（共3页） 学科网（北京）股份有限公司 $ 学校:___________姓名：___________班级：___________考号：___________ Unit 4 School Days 时间介词at on in和频度副词 （时间：60分钟，满分：100分） 频度副词 频度副词 含义 频率程度 示例句子 always 总是 100% She always drinks coffee in the morning. usually 通常 90% I usually walk to work. often 经常 70% They often play football after school. sometimes 有时 50% He sometimes forgets his keys. occasionally 偶尔 30% We occasionally eat out. seldom 很少 10% She seldom watches TV. rarely 极少 5% He rarely gets angry. never 从不 0% I never eat fast food. 时间介词 介词 用法 示例 on 用在表示具体的日期、星期几、特定的节日(一天)、具体某一天的上午、下午或晚上前。 on October 1st on Friday on Children’s Day on Monday morning in 用于年、季节、月份前,也可以泛指在上午、下午或晚上。 in 2020 in winter in March in the afternoon at 用于表示具体时刻、年龄或noon、 night等前。 at 8:00 at six(years old)/at the age of six at noon 单项选择(本大题共50小题，每小题2分，共100分) 1．—Do you often do exercise to keep fit, Jackson? —No, ________. I don’t like sports at all. A．always B．usually C．often D．never 【答案】D 【详解】句意：——Jackson，你经常锻炼来保持健康吗？——不，从不。我一点也不喜欢运动。 always总是；usually通常；often经常；never从不。根据答语“No”和“I don’t like sports at all”可知，说话者完全不喜欢运动，因此不会去锻炼，表示频率为零的词是never，符合语境。 2．Linda studies ________ for her exam, but she ________ makes progress. A．hard, hardly B．hardly, hard C．hardly, hardly 【答案】A 【详解】句意：琳达为了考试学习很努力，但她几乎没有什么进步。 hard努力地；hardly几乎不。根据前半句“为了考试学习”可知，应用副词hard修饰“studies”，表示努力学习；后半句由转折连词“but”连接，表示虽然努力但“几乎不”进步，用hardly。 3．My classmate Li Tao is _______ full of energy because he plays basketball every afternoon. A．never B．sometimes C．seldom D．always 【答案】D 【详解】句意：我的同学李涛总是精力充沛，因为他每天下午都打篮球。 never从不；sometimes有时；seldom很少；always总是。根据后半句“he plays basketball every afternoon”可知，规律运动带来的结果是一直保持充沛的精力，always符合语境。 4．—Why does your father ________ go to work by car? —Because he thinks walking is good for health. A．sometimes B．always C．seldom D．usually 【答案】C 【详解】句意：——为什么你爸爸很少开车去上班？——因为他认为走路对健康有益。 sometimes有时；always总是；seldom很少；usually通常。根据答句“walking is good for health”可知，他认为走路好，所以“很少”开车上班，应填seldom。 5．It’s bad for us to drink too much coffee, so I ________ drink it. A．seldom B．often C．always D．sometimes 【答案】A 【详解】句意：喝太多咖啡对我们有害，所以我很少喝它。 seldom很少；often经常；always总是；sometimes有时。根据“It’s bad for us to drink too much coffee”可知，咖啡喝太多对身体不好，所以推测出“我”很少喝它。 6．People ________ feed pigeons in the community park every morning. A．never B．often C．seldom D．hardly 【答案】B 【详解】句意：人们每天早上经常在社区公园喂鸽子。 never从不；often经常；seldom很少；hardly几乎不。根据时间状语“every morning”可知，此处描述的是习惯性动作，never、seldom、hardly 均表示否定或低频含义，与“every morning”语意矛盾，often符合逻辑，应填often。 7．—I hate vegetables. I ________ eat them. —But they’re good for your health! You should eat them. A．seldom B．often C．usually 【答案】A 【详解】句意：——我讨厌蔬菜。我很少吃它们。——但它们对你的健康有好处！你应该吃它们。 seldom很少；often经常；usually通常。根据“I hate vegetables”可知讨厌蔬菜，所以很少吃。应填seldom。 8．—What’s your mother’s lifestyle? —She ________ stays up late and always gets up early. A．often B．usually C．never D．sometimes 【答案】C 【详解】句意：——你妈妈的生活方式是什么样的？——她从不熬夜，总是早起。 often经常；usually通常；never从不；sometimes有时。根据答语中“always gets up early”总是早起，可知生活习惯良好，推测出她“从不”熬夜。 9．We ________ have a big dinner on New Year’s Eve. It’s our tradition. A．never B．seldom C．sometimes D．always 【答案】D 【详解】句意：我们在除夕夜总是吃一顿丰盛的大餐。这是我们的传统。 never从不；seldom很少；sometimes有时；always总是。根据后句“It’s our tradition.”可知这是家庭传统，表示经常性的习惯，因此选择表示频率最高的词。故选D。 10．My father ________ plays soccer with me because he is very busy. A．always B．often C．usually D．seldom 【答案】D 【详解】句意：我爸爸很少和我一起踢足球，因为他非常忙。 always总是；often经常；usually通常；seldom很少。根据“because he is very busy”可知，爸爸非常忙，推测出他很少和我一起踢足球，应填seldom。 11．I ________ walk to school. I always take the school bus. A．often B．sometimes C．never 【答案】C 【详解】句意：我从不步行去上学。我总是坐校车。 often经常；sometimes有时；never从不。根据“I always take the school bus.”可知，“我”从不步行去上学。 12．I like skateboarding. I ________ practise it at the park with my friends. A．never B．often C．hardly ever 【答案】B 【详解】句意：我喜欢滑板。我经常在公园和我的朋友们练习它。 never从不；often经常；hardly ever几乎不。根据前句“I like skateboarding”可知，因为喜欢滑板，所以推测出应该是“经常”去练习，而不是“从不”或“几乎不”。故选B。 13．Tony is busy with his study, so he ________ hangs out with friends on school days. A．often B．usually C．hardly ever D．always 【答案】C 【详解】句意：托尼忙于学习，所以在上学的日子里他几乎不和朋友出去玩。 often“经常”；usually“通常”；hardly ever“几乎不”；always“总是”。根据“Tony is busy with his study”可知托尼很忙，推测出他很少有空闲时间和朋友出去玩，应填hardly ever。 14．—The weather is getting hot. Do you go swimming with your parents? —Not very often. We go ________. A．always B．sometimes C．usually 【答案】B 【详解】句意：——天气变热了，你和父母去游泳吗？——不经常。我们有时去。 always总是；sometimes有时；usually通常。根据答语“Not very often”可知，游泳的频率不高，always和usually表示频率较高，应填sometimes。 15．I ________ tried a salty zongzi before, so this year I will try one. A．always B．often C．never D．sometimes 【答案】C 【详解】句意：我以前从未尝过咸粽子，所以今年我要尝一个。 always总是；often经常；never从未；sometimes有时。根据“so this year I will try one”可知，因为以前从未尝过，所以今年打算尝试，never 符合语境。 16．My brother ________ plays basketball on weekends. He likes it very much. A．never B．seldom C．always D．sometimes 【答案】C 【详解】句意：我哥哥总是在周末打篮球。他非常喜欢这项运动。 never从不；seldom很少；always总是；sometimes有时。后一句说“He likes it very much.”，说明他周末打篮球的频率很高，应填always。 17．Tom lives far away from school. But he is ________ late for school. A．sometimes B．often C．never D．usually 【答案】C 【详解】句意：汤姆住得离学校很远。但是他上学从不迟到。 sometimes有时；often经常；never从不；usually通常。根据“But”可知，前后句是转折关系，表示虽然汤姆住得离学校很远，但是他上学从不迟到。应填never。 18．—Do you often have hamburgers? —I ________ have hamburgers. I dislike them. A．often B．never C．usually D．always 【答案】B 【详解】句意：——你经常吃汉堡包吗？——我从不吃汉堡包。我不喜欢它们。 often经常；never从不；usually通常；always总是。根据句意“I dislike them”可知，不喜欢所以从不吃，故选never。 19．My dad ________ makes kites because he is not good at handwork. A．always B．usually C．often D．seldom 【答案】D 【详解】句意：我爸爸很少做风筝，因为他不擅长手工。 always总是；usually通常；often经常；seldom很少。根据“because he is not good at handwork”可知，他不擅长手工，推测出他很少做风筝，应填seldom。 20．I don’t have much time to play ball games. I ________ play ball games. A．never B．seldom C．always D．sometimes 【答案】B 【详解】句意：我没有太多时间玩球类游戏。我很少玩球类游戏。 never从不；seldom很少；always总是；sometimes有时。根据前半句“I don’t have much time”可知，此处表达打球频次低，选用seldom。 21．—I notice you hardly ever eat fast food. Is that true? —Well, I ________ go to KFC because it’s unhealthy. A．sometimes B．always C．usually D．seldom 【答案】D 【详解】句意：——我注意到你几乎从不吃快餐。是这样吗？——嗯，我很少去肯德基，因为它不健康。   sometimes有时；always总是；usually通常；seldom很少。根据“hardly ever”及“it’s unhealthy”可知，因为不健康所以很少去，seldom符合语境。 22．My grandfather is in good health. He ________ eats fast food. A．often B．usually C．seldom D．always 【答案】C 【详解】句意：我的祖父身体状况良好。他很少吃快餐。 often经常；usually通常；seldom很少；always总是。根据“My grandfather is in good health.”可知，身体健康，因为很少吃快餐。 23．—Do you often do chores at home? —No, I ________ do but I plan to change because I don’t want to depend on my parents. A．always B．often C．usually D．seldom 【答案】D 【详解】句意：——你经常在家做家务吗？——不，我很少做，但我计划改变，因为我不想依赖父母。 考查频度副词辨析。always总是；often经常；usually通常；seldom很少。根据“No”可知，回答是否定的，说明目前做家务的频率很低，因此应选表示频率低的副词。故选D。 24．DeepSeek is so powerful that it can ________ give answers to your questions. A．always B．never C．seldom D．sometimes 【答案】A 【详解】句意：DeepSeek如此强大，以至于它总能给出你问题的答案。 考查副词辨析。always总是；never从不；seldom很少；sometimes有时。根据“so powerful that...”可知，强调其强大能力，因此应选择表示肯定且频率高的词。故选A。 25．My father ________ watches TV. He thinks watching TV is a waste (浪费) of time. A．often B．seldom C．always D．usually 【答案】B 【详解】句意：我父亲很少看电视。他认为看电视是浪费时间。 考查副词辨析。often经常；seldom很少；always总是；usually通常。根据“He thinks watching TV is a waste of time.”可知，认为是浪费时间，所以很少看电视。故选B。 26．Most schools in China begin their autumn term ________ September 1st. Do you know why? A．in B．at C．on D．of 【答案】C 【详解】句意：中国的大多数学校在9月1日开始秋季学期。你知道为什么吗？ in在……里；at在……；on在……上；of……的。in用于年、月、季节前；at用于具体时刻前；on用于具体某一天或日期前。根据“September 1st”可知是具体的日期，应用on。 27．Do you read your favourite books ________ April 23rd? It is World Book Day. A．for B．at C．on 【答案】C 【详解】句意：你在4月23日读你最喜欢的书吗？那天是世界读书日。 for为了/持续；at在具体时刻；on在具体某一天。根据“April 23rd”可知，是具体的日期，应用介词on。 28．I get up ________ 6:00 ________ the morning. A．at; in B．in; at C．on; in D．at; on 【答案】A 【详解】句意：我早上 6 点起床。 at用在具体时刻前；in用在泛指的上午、下午、晚上前；on用在具体的某一天前。第一空后是6:00，为具体时刻，用at；in the morning是固定搭配，意为“在早晨”。 29．Ice skating is the most common sport ________ winter. A．in B．at C．of D．for 【答案】A 【详解】句意：滑冰是冬季最常见的运动。 in在……里面（用于季节、月份、年份等）；at 在……（用于具体时刻）；of……的；for为了（后接时间段）。根据“winter”可知，指的是季节，在季节前要用介词in。 30．We usually get a lot of nice gifts ________ Children’s Day. A．on B．at C．/ D．in 【答案】A 【详解】句意：我们通常在儿童节收到很多漂亮的礼物。 on在 (具体某一天或节日)；at在 (具体时刻)；/零冠词；in在 (泛指某年某月某季节)。根据“Children’s Day”为具体节日，应用介词on。 31．My family always have a party ________ the evening of October 31st, and the party usually starts ________ 8:00 p.m. A．at; at B．on; on C．at; on D．on; at 【答案】D 【详解】句意：我的家人总是在10月31日晚上举行聚会，聚会通常在晚上8点开始。 on常用来表示具体某一天或特指某天的早晚；at常用来表示具体的钟点时间。题干中“the evening of October 31st”特指10月31日的晚上，故第一空用on；“8:00 p.m.”为具体钟点，故第二空用at。 32．Tom usually goes to bed ________ nine. A．from B．at C．in D．on 【答案】B 【详解】句意：汤姆通常九点睡觉。 from从……；at在……（时刻）；in在……（里面/年月等）；on 在……（上面/具体某天）。根据“nine”可知是具体时刻，具体时刻前用介词at。 33．—What time do you go to school in the morning, Sally? —________ 7:50. A．On B．In C．At D．For 【答案】C 【详解】句意：——萨莉，你早上几点去上学？——在7点50分。 on用于具体日期；in用于年、月、季节、泛指早中晚；at用于具体时刻；for后接一段时间。根据答句“7:50”是具体的时间点可知，此处表达“在……时刻”，应填At。 34．She takes a shower ________ 7:00 ________ the evening. A．in; in B．at; on C．at; in 【答案】C 【详解】句意：她晚上7点洗澡。 in用在上午、下午、晚上；at用在具体时刻前；on用在具体的某一天前。“7:00”是具体时刻，用at；“the evening”是晚上，用in。 35．I go to the Science Club ________ Tuesdays and Fridays. A．in B．at C．on D．for 【答案】C 【详解】句意：我每周二和周五去科学俱乐部。 in在……里 (年/月/季节)；at在……时刻；on在……上 (具体某一天)；for为了/接时间段。根据“Tuesdays and Fridays”可知，是具体的星期几，具体某一天前用介词on。 36．My birthday is ________ June 8th, and it is ________ summer. A．on; in B．in; on C．at; in D．on; at 【答案】A 【详解】句意：我的生日在6月8日，并且在夏天。 on在，具体日期；in在，月份/季节/年份；at在，具体时刻。第一空后为具体日期“June 8th”，用介词on；第二空后为季节“summer”，用介词in。 37．We start lessons ________ eight o’clock ________ Monday morning. A．at;in B．on;in C．at;on D．on;at 【答案】C 【详解】句意：我们周一早上八点开始上课。 at用于具体时刻前；on用于具体某一天或特定某天的上午、下午、晚上前；in用于泛指的上/下午或年月季节前。根据“eight o’clock”是具体时刻，第一空用at；根据“Monday morning”是具体某天的上午，第二空用on。 38．School finishes ________ 4:30 p.m. ________ weekdays. A．in; on B．at; on C．at; in D．on; at 【答案】B 【详解】句意：学校在工作日下午4:30放学。   in用于年、月、季节或上下午、晚上；on用于具体某天或特定日期的上下午、晚上；at用于具体时刻。第一空：4:30为具体时刻，应用at。第二空：weekdays“工作日”为具体日期范围，on weekdays是固定搭配，意思是“在工作日”，应用on。 39．My teacher runs ________ the morning. But he doesn’t run ________ Sunday mornings. A．in; on B．on; in C．in; in 【答案】A 【详解】句意：我的老师早上跑步。但是他在周日早上不跑步。 in用于泛指的时间段，用于年、月、季节、早、中、晚前；on用于具体某一天或特定某一天的早中晚。第一空泛指“在早上”，用in；第二空特指周日的早上，用on。故选A。 40．—What do you have ________ Monday? —We have Chinese, math and English. A．in B．on C．at D．for 【答案】B 【详解】句意：——你星期一有什么课？——我们有语文、数学和英语。 in在……里；on在（某个具体日期或星期）；at在（某时刻）；for为了。根据“…Monday”可知，Monday表示“星期一”，在具体星期前应用介词on。 41．We have lunch ________ twelve o’clock at school. A．in B．on C．at D．for 【答案】C 【详解】句意：我们在学校十二点吃午饭。 in用于年、月、季节、早中晚等；on用于具体日期、星期、具体某天早中晚；at用于具体时刻点；for后接一段时间。根据“twelve o’clock”可知是具体时刻，具体时刻前用介词at。 42．—What time do you usually get up? —________ 6:45 in the morning. A．In B．On C．At D．For 【答案】C 【详解】句意：——你通常几点起床？——在早上6点45分。 In用于年、月、季节、泛指上午下午晚上前；On用于具体某一天或某天早中晚前；At在……时刻；For后接一段时间表时长。根据“6:45”可知是具体时刻，前面应用介词At。 43．—What’s your school trip to Hongshan Zoo like? —Amazing! We leave early ________ the morning and the trip lasts the whole day. A．on B．in C．at D．for 【答案】B 【详解】句意：——你们去红山动物园的学校旅行怎么样？——太棒了！我们在早上很早出发，旅行持续一整天。 on在具体某一天；in在（泛指的）上午、下午或晚上；at在具体时刻；for持续（一段时间）。根据空后的“the morning”可知，此处是泛指清晨时段，应填in。 44．We have geography ________ Monday morning. A．in B．on C．at D．for 【答案】B 【详解】句意：我们在周一上午有地理课。 in后接世纪、年、月、季节等；on后接具体某一天的上午、下午或晚上；at后接具体时刻；for后接一段时间。根据“Monday morning”可知是具体某一天的上午，要用介词on。 45．—Why are you often late for school? —Sorry, Mr Li. It’s very hard for me to get up ________ a cold winter morning. A．in B．on C．at D．of 【答案】B 【详解】句意：——你为什么经常上学迟到？——对不起，李老师。在一个寒冷的冬日早晨起床对我来说很难。 in在……里；on在……上；at在；of……的。根据答语中“a cold winter morning”可知，虽然泛指早晨用in the morning，但当早晨、下午或晚上前有形容词修饰特指某一天的某个时段时，应用介词on。 46．Our school has ________ Open Day ________ every October. Parents can come and watch lessons on that day. A．an; in B．a; / C．the; in D．an; / 【答案】D 【详解】句意：我们学校每年十月有一个开放日。父母那天可以来听课。 an不定冠词，用于元音音素开头的单词之前；a不定冠词，用于辅音音素开头的单词之前；in介词，在……时；/不填。Open Day是以元音音素开头的可数名词单数，表示泛指“一个”，应用不定冠词an；时间状语every October前面有every修饰，不再加介词in。应填an; /。 47．They often go climbing ________ sunny days and come back ________ the afternoon. A．on；on B．in；in C．on；in D．in；on 【答案】C 【详解】句意：他们经常在晴朗的日子去爬山，并在下午回来。 on用于指具体的某一天；in用于泛指一天中的早、中、晚。sunny days指具体的日子，所以第一空填on；in the afternoon泛指“在下午”，因此第二空填in。 48．He was born ________ May 5th, 2012, and his first birthday was ________ a rainy day. A．in; on B．on; on C．on; in D．in; in 【答案】B 【详解】句意：他出生于2012年5月5日，他的第一个生日是在一个雨天。 in接年/月/季节；on在具体某天。第一空后为May 5th, 2012，是具体几月几号，具体日期前介词用on；第二空后为a rainy day，特指下雨那一天，具体某一天前面介词也用on。 49．I have Biology classes ________ Friday morning. They begin at 8:30. A．in B．at C．on D．for 【答案】C 【详解】句意：我在周五上午有生物课。它们在8:30开始。 in用于泛指的早中晚、月份、季节、年份前；at用于具体时刻、节日、固定搭配（如 at night）前；on用于具体某一天，或具体某一天的早/中/晚前；for后接时间段，表动作持续时长。根据“Friday morning”可知，具体到某一天的早上用介词on。 50．We have Chinese ________ Monday and Friday. A．in B．at C．on D．for 【答案】C 【详解】句意：我们星期一和星期五有语文课。 in在……，用于年份、月份季节等前；at在……，用于时间点前；on在……，用于具体的某一天前；for为了，后常接时间段。根据“Monday and Friday”可知是具体的星期几，在具体某一天前应用介词on。 试卷第1页（共3页） 试卷第1页（共3页） 学科网（北京）股份有限公司 $