Unit7知识点 C部分练习 2025-2026学年沪外教版七年级英语上册

七年级英语上册Unit7知识点-C部分练习 小试牛刀 A. 选用方框中的动词短语填空（每个限用一次） | have lost | has risen | have cut | has made | have burned | 1. The sea level ____________________ a lot because of global warming. 2. Some polar bears ____________________ their homes. 3. Factories ____________________ a lot of fuels such as oil and gas. 4. People ____________________ down many forests for wood. 5. Global warming ____________________ life difficult for polar bears. B. 句型转换（改为现在完成时的一般疑问句并作肯定或否定回答） 1. The ice has started to melt earlier. 一般疑问句：_________________________________________________ 肯定回答：_________________ 否定回答：_________________ 2. Scientists have found the causes of climate change. 一般疑问句：_________________________________________________ 肯定回答：_________________ 否定回答：_________________ 3. You have heard the news about global warming. 一般疑问句：_________________________________________________ 肯定回答：_________________ 否定回答：_________________ 配套练习 A. 单项选择（★） 从A、B、C、D中选择最佳答案。 1. We use the present perfect tense to talk about something that happened in the past but is ______ in the present. A. finished B. important C. future D. unreal 2. Which sentence is in the present perfect tense? A. They lost their homes. B. They have lost their homes. C. They lose their homes. D. They will lose their homes. 3. What is the past participle of “do”? A. doed B. did C. done D. doing 4. “I have ______ finished my homework.” Which word fits best? A. yet B. just C. ever D. never 5. “They haven’t arrived ______.” Which word fits best? A. already B. just C. yet D. always B. 完成句子（★★） 用所给动词的现在完成时形式填空。 1. The Earth’s temperature ____________________ (rise) by about one degree. 2. I ____________________ (read) a book about global warming. 3. We ____________________ (produce) too much carbon dioxide. 4. They ____________________ (not find) a solution to the problem yet. 5. ____________________ you ever ____________________ (see) a polar bear? 拓展思考 写一段话（至少5句）描述你或你的家人为保护环境已经做过的事情。使用现在完成时和 already, just, yet 至少各一次。 _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ 参考答案与解析 小试牛刀 A 1. has risen 2. have lost 3. have burned 4. have cut 5. has made 小试牛刀 B 1. Has the ice started to melt earlier? Yes, it has. / No, it hasn’t. 2. Have scientists found the causes of climate change? Yes, they have. / No, they haven’t. 3. Have you heard the news about global warming? Yes, I have. / No, I haven’t. 配套练习 A 1. B（对现在重要） 2. B（have lost是现在完成时） 3. C（done） 4. B（just表示刚刚） 5. C（yet用于否定句或疑问句） 配套练习 B 1. has risen 2. have read 3. have produced 4. haven’t found 5. Have, seen 拓展思考（示例） My family has already done many things to help the environment. We have just started to sort our rubbish into different bins. We have turned off lights when we leave a room. We haven’t used plastic bags for a long time yet — we still need to be better. I have also talked to my friends about saving water. I hope we can do more. 1 学科网（北京）股份有限公司 $