【单选题】We know the atmosphere as ______.
A.the total amount of oxygen over the earth
B.mixture of gases surrounding the earth
C.a source of storms
D.the diffusion of waste gas
网考网参考答案:B
网考网解析:
综合第一和第二段首句可得出本题答案。
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【单选题】We know the atmosphere as ______.
A.the total amount of oxygen over the earth
B.mixture of gases surrounding the earth
C.a source of storms
D.the diffusion of waste gas
网考网参考答案:B
网考网解析:
综合第一和第二段首句可得出本题答案。
查看试题解析出处>>
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