1. A。空气通常被看成是裹在地球外表的毯子。
15. A. exam B. study C. exercise D. know
名师点评
本篇着重介绍与人们的生活休戚相关的地球、水、空气以及人们对它们的认识过程。这是一篇说明文,文章浅显易懂。
答案简析
14. A. When B. As C. Since D. Though
13. A. True B. Read C. In fact D. Correctly
12. A. too B. neither C. also D. either
11. A. End B. At last C. Hardly D. Nearly
10. A. believe B. planned C. decided D. want
9. A. That B. For C. As D. So
8. A. called B. told C. name D. said
7. A. found B. thought C. knew D. understood
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