Smart dust sensors can do all the following EXCEPT______. By "physical environment"(Line 2, Paragraph 2), the writer means such

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问题 Smart dust sensors can do all the following EXCEPT______.
By "physical environment"(Line 2, Paragraph 2), the writer means such elements as______.

选项 A、the position of military troops
B、the presence of minicomputers
C、the strength of radio signals
D、the amount of water vapor in the air

答案D

解析 elements such as temperature,moisture,humidity,pressure,energy use,vibration,light,motion,radiation,gas,and chemicals中有气体,所以选D。本题也属于细节题,只要回到原文找到正确的对应项就可以了。
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