Unit7知识点 B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-B部分练习 小试牛刀 A. 选用方框中的短语填空（每个限用一次） | hunting ground | melt earlier | lose their homes | in our hands | let them down | 1. The frozen Arctic is the polar bear’s ____________________. 2. The ice has started to ____________________ each year. 3. Homeless polar bears ____________________ and must move to land. 4. Their future is ____________________. We must act now. 5. We mustn’t ____________________. We should help them. B. 句型转换（改为一般疑问句并作肯定或否定回答） 1. We use fuel for energy. 一般疑问句：_________________________________________________ 肯定回答：_________________ 否定回答：_________________ 2. The ice melts earlier each year. 一般疑问句：_________________________________________________ 肯定回答：_________________ 否定回答：_________________ 3. Polar bears become very hungry because they can’t find enough food. 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. Where do polar bears live? A. In the Antarctic. B. In the Arctic. C. In the forest. D. In the desert. 2. What do polar bears hunt for on the ice? A. Fish. B. Seals. C. Rabbits. D. Birds. 3. Why do polar bears become hungry? A. Because they don’t like to eat. B. Because they can’t find enough food when ice melts. C. Because they move to land. D. Because they sleep too much. 4. As a result of global warming, the ice ______. A. becomes thicker B. melts earlier C. stays longer D. turns green 5. What does the writer want us to do? A. Use more fuel. B. Help polar bears. C. Move to the Arctic. D. Stop eating seals. B. 完成句子（★★） 根据句子内容，用正确的词汇完成句子。 1. 我们使用燃料获取能源，但这使气候变暖。 We use fuel for ______, but it is making the ______ warmer. 2. 因此，冰融化，海平面上升。 ______ ______ ______, the ice melts and the sea level rises. 3. 北极熊站在海冰上等待海豹上来呼吸时捕猎。 A polar bear ______ on the sea ice to ______ for seals when they come up for air. 4. 无家可归的北极熊不得不更早地离开冰面来到陆地。 Homeless polar bears have to ______ from ice to land ______. 5. 我们绝不能让他们失望。 We ______ let them ______. 拓展思考 写一段话（至少5句）说明全球变暖如何影响一种动物（可以是北极熊或其他动物）。描述原因和结果。使用 because、as a result、so 等表达因果关系。 _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ 参考答案与解析 小试牛刀 A 1. hunting ground 2. melt earlier 3. lose their homes 4. in our hands 5. let them down 小试牛刀 B 1. Do we use fuel for energy? Yes, we do. / No, we don’t. 2. Does the ice melt earlier each year? Yes, it does. / No, it doesn’t. 3. Do polar bears become very hungry because they can’t find enough food? Yes, they do. / No, they don’t. 配套练习 A 1. B（北极） 2. B（海豹） 3. B（找不到足够食物） 4. B（更早融化） 5. B（帮助北极熊） 配套练习 B 1. energy, climate 2. As a result 3. stands, hunt 4. move, earlier 5. mustn’t, down 拓展思考（示例） Global warming makes the Arctic ice melt earlier each year. Polar bears use the ice as their hunting ground. Because the ice disappears, they cannot hunt seals easily. As a result, they become very hungry and weak. So they have to move to land, but there is not enough food there. We mustn’t let them die. We should use less fuel and stop global warming. 1 学科网（北京）股份有限公司 $