Unit 4 Astronomy: the science of the Stars Period 2 exercise I. Fill in the blanks with the words in unit 4. Small clever animals, now (1)________ hands and feet, appeared and (2)________ all over the earth. They developed new (3)________ of growing food, hunting and moving around. As time went by they (4)________ the earth and have become the most important animals on the planet. But they are not (5)________ care of the earth very well. They are putting too much carbon dioxide into the (6)________, which prevents heat from (7)________ from the earth into space. The earth may become too hot for the lives on it. (8)________ life will continue on the earth for millions of years to come will (9)________ (10)________ whether this problem can be solved. II．Complete the following sentences with words in unit 4. 1. A __________(猛烈的) typhoon called Damrey attacked Hainan.2. The ______________(冲洗) of photo films requires a dark room.3. People used to think this fish is ________(有害的).4. The trees are a _________(一片) of green to the eye.5. I don’t quite get the ___________(窍门) of driving a car.6. People e___________ fireworks to celebrate the Spring Festival.7. We were d___________ to hear that you couldn’t come.8. Most of the s___________ of the earth is covered by water.9. G____________ speaking, women lives longer than men.10. The soldiers took the prisoners away by f________. 参考答案 I. 1. with 2. spread 3. methods 4. covered 5. taking 6. atmosphere 7. escaping 8. Whether 9. depend 10. on II. 1. fierce 2. development 3. harmful 4. mass 5. hang 6. explode 7. disappointed 8. surface 9. Generally 10. force

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