摘要:根据短文内容及所给的首字母提示.填写单词. Where does the wind come from? What makes air m l all the time? Scientists tell us that it is the sun出at makes it move.and makes it b 2 .When I the sun s 3 .it beats the earth.Then the earth heats the air above it.As the air b 4 hotter, it also becomes l 5 .The hot air rises.Cooler air r6 in to take its p 7 . The hot, l 8 air rises higher and higher u 9 it becomes cool again.Then it descends.The cycle is repeated.W 10 the air moves.we have wind. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10.

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