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Small clever animals,now with hands and feet,appeared and spread all over the earth.They developed new methods of growing food,hunting and moving around.As time went by they covered the earth and have become the most important animals on the planet.But they are not taking care of the earth very well.They are putting too much carbon dioxide into the atmosphere,which prevents heat from escaping from the earth into space.The earth may become too hot for the lives on it.Whether life will continue on the earth for millions of years to come will depend on whether this problem can be solved. 1.Think about what you have read and make choices. (1)Why was the earth different from other planets? A .It produced a lot of heat. B . The water remained. C .Water disappeared. D . It was the oldest planet. (2)Why was life able to develop on the earth but not on other planets? 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 planets. D . The earth was not too hot and not too cold. (3)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. (4)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. 2.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 _____ ______ _____ _____ _____ _____ _____ _____ _____ 3.Answer the following questions. (1)why is it wrong in films and stories to show dinosaurs and people together? _________________________________________________________ (2)Why do you think that humans are the cleverest animals on the earth? 六 语法 can’t help but do can’t help to do (can’t) help doing 1.I’m afraid I can’t help ____the house because I have a meeting to attend right now. A.clean B.cleaning C. but clean D. but to clean 2.On hearing the news she can’t help _____. A. laugh B. laughing C.but laugh D. but to laugh 3.I can’t help _____ that we have no right to destroy nature. A. think B.thinking C.but think D.but to think (do) but do sth. but to do (责任编辑：admin) |