本题目来源于试卷: Continuity and Change D.11 Stability & Change，类别为 IB生物学
[单选题]
Nutrients are constantly cycled in ecosystems, including in th2v7jrni)l5/l sguo 1oe ak:a*kp,2 twls)ms2j ntmosphere as a g*jsl:t,)wksapnm 22k aseous form. Which of the following elements is not found in the atmosphere?
A. Carbon
B. Sulfur
C. Nitrogen
D. Phosphorus
参考答案: D
本题详细解析:
Unlike the other elements, phosphorus is not found as a gas, Carbon exists as a gas in the atmosphere in the form of carbon dioxide, carbon monoxide, and methane (Choice A). Sulfur can be found as sulfur dioxide which mainly comes from burning coal (Choice B). Nitrogen gas is inert and found in the atmosphere and oxides of nitrogen are emitted during the combustion of fossil fuels. (Choice C)
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