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素能提升演练（十四）
必修3 Unit 4
Ⅰ. 单词拼写
1. What do you think of the new ________（制度）？
2. “What happened？” John’s mother asked him in a ________ (温和的) voice.
3. Before the Earth’s protective ________ (大气层) was formed，there was no life except in the sea.
4. With the ________ (引力) of the moon and the sun each day，tides (潮汐) roll in and roll away.
5. He managed to finish the race, ________ (不像) more than half of the competitors.
6. His face wore a ________ (困惑的，迷惑的)expression.
7. Eating too many desserts can be ________ (有害的) to one’s teeth.
8. The plane ________ (坠毁，碰撞) into the mountain.
