Unit 13 We' re trying to save the earth! Section A (1a~3b) 一、根据句意，用所给单词的适当形式填空。 1. Many people are throwing (litter) into the river. 2. I think a (wood) chair is more comfortable than a metal one. 3. Several (fisherman) were saved from the storm last night. 4. She thought she was the (ugly) among the girls. 5. Freezing weather is (harm) to apple trees.21世纪教育网版权所有 二、单项选择。 ( )1. They walked home last night because they couldn't to take a taxi. A. leave B. buy C. afford D. allow ( )2.The number of the volunteers in our city 2,000. And sixty percent of them teachers and students. A. is; is B. Is; are C. Are; is D. are; are ( )3. --What will the phone ? --The same as you said, eight hundred dollars each. A. spend B. cost C. pay D. afford ( )4. Miss Brown, we cleaning our classroom. Can we go home now? A. finish B. finishing C. are finished D. have finished ( )5. Jane Peter is warm-hearted. They're popular with our class. A. Both; and B. Not only; but also C. Neither;nor D. Either; or ( )6. --Do you have any plans for this Sunday? --I'm not sure. I go to the countryside to see my grandmother. A. can B. must C. may D. need ( )7. I couldn't do it your great help. Thanks a lot! A.with B. without C. for D. to ( )8. Many of the animals are in . We should protect them. A. danger B. surprise C. fact D. all ( )9. The box is heavy for me to carry. Please give me a hand. A. so B. such C. enough D. too ( )10.--I think we should take action to protect the endangered animals. -- . A.So I do B. Me neither C. Me too D. So I am 三、按要求改写句子，每空一词。 1. She has already finished her homework. (改为否定句) She her homework . He made me do homework for him.（改为被动语态） I was made homework for him. 3．Gina's never been to the Great Wall.（完成反义疑问句） Gina's never been to the Great Wall, ? 4．The river used to be so clean.（改为一般疑问句） the river to be so clean? The little boy bought the toy car two days ago. (改为同义句) The little boy the toy car for two days. 四、阅读理解。 Pollution inside homes and other buildings kills more than 4 million people each year. Many people die as a result of breathing smoke or from cooking over wood-powered or coal-powered stoves. One way to reduce the number of deaths is through cooking equipment powered by the sun. Crosby Menzies, a solar power expert in a South African company, described his latest solar cooker called the "Sol-4". "It is four square meters of mirrors, six to eight meters in length. It is quite a large cooker. "21cnjy.com The "Sol-4" works by reflecting (反射) light from the sun off large mirrors. The mirrors direct (把......对准) the light at a cooking pan. Then the light heats the pan with solar energy. Within two minutes, the pan is hot enough to cook sausages and onions. In just four minutes, water can be boiled. That is as fast as cooking with natural gas or electricity. The cooker is also much "friendlier" than other models because people do not have to stan ... ...
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