本题目来源于试卷: Atmospheric Structure & Function，类别为 IB环境系统与社会
[单选题]
Identify the pie chart that most a n*hgccmp2 t)r oya.70 0 p(slfccurately represents the compo w1oc3 4dv-3wn.r qcyr sition of the atm c -1ncv3dw.4w r3 rqyoosphere.
 
A.
B.
C.
D.
参考答案: B
本题详细解析:
The composition of a DRY atmosphere is approximately:
78% nitrogen 21% 0gxvi;23w 8 vizp /,j:gwu zkvh*imj+fe6 qw( oxygen 1% argon 0.04% carbon dioxide very little of trace gases
However, there is also a varying amount of water vapour in the air. It is about 1% of the atmosphere at sea level and 0.4% on average for the whole atmosphere.
Still, that is very littfvv (mxg 0;/i2 *: +wgehk,zvwii6u q8 zwj3pjle and so, given that there is very little carbon dioxide and other gases that are found in trace amounts, the pie chart of Earth’s atmospheric composition only shows 4 slices clearly, as in option B.
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