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【单选题】
组成核糖和核酸的化学元素分别是 [ ]A.
C、H、O和C、H、O、N、P
B.
C、H、O、P和C、H、O、N、S
C.
C、H、O、N和C、H、O、N、P
D.
C、H、O、S和C、H、O、N、P、S
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【单选题】听力原文： The U.S. Space Agency NASA says Russia's orbiting Mir space station has lost its primary and backup oxygen sources. If the problem is not fixed, the 3-member crew would have to abort the mission...
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C.
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D.
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A.
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B.
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America's
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Russia's
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Japan's
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