【正文】
r this problem can be solved. Think about what you have read and make choices. Why was the earth different from other plas? A .It produced a lot of heat. B . The water remained C .Water disappeared. D . It was the oldest pla. Why was life able to develop on the earth but not on other plas? A . The earth had a solid shape. B . The earth did not have barmful gases in its atmosphere. C . The water stayed on the earth but not on other plas. D . The earth was not too hot and not too cold. Why was it necessary for plants to grow before animals? A . Animals needed plants to protect them from the sun. B . Plants provided oxygen for animals to breathe. C . Animals could hide from hunters in forests. D . It was easier for plants to grow. What problem is caused by human beings? A . They exist everywhere on the earth. B . They cause global warming. C . They find new methods of growing crops. D . They enjoy hunting and fishing. Put the order of development of life into a time line. A insects and amphibians appear B a solid ball C reptiles appear D a cloud of dust E shellfish and other fish appear F dinosaurs appear G small plants grow on the water H plants begin to grow on dry land I presence of water J mammals (including humans) appear D _____ ______ _____ _____ _____ _____ _____ _____ _____ Answer the following questions. why is it wrong in films and stories to show dinosaurs and people together? _________________________________________________________ Why do you think that humans are the cleverest animals on the earth? 六 語(yǔ)法 can’t help but do can’t help to do (can’t) help doing I’m afraid I can’t help ____the house because I have a meeting to attend right now. C. but clean D. but to clean On hearing the news she can’t help _____. A. laugh B. laughing laugh D. but to laugh I can’t help _____ that we have no right to destroy nature. A. think think to think (do) but do sth. but to do was raining didn’t have any choice but _____ at home. A. to stay B. stay was raining could do nothing but _____ at home. A. to stay B. stay 被動(dòng)語(yǔ)態(tài) Jim should love ____ to the theatre this evening . A. to be taken B. to take C. being taken D. taking 2. The flue is believed _____ by viruses that like to reproduce in the cells inside the human nose and