单选题
It can be inferred from the passage that one reason scientists consider local water from the solar nebula a necessary ingredient in the earth's oceans is that
A、
(A) it is improbable that enough volume of water from comets existed to fill the earth's oceans
B、
(B) the water from the solar nebula contains less deuterium than sea water
C、
(C) the water from the solar nebula existed close enough to the earth to participate in the accretion process
D、
(D) without the water from the solar nebula more xenon would otherwise exist in seawater
E、
(E) without the water from the solar nebula the earth's oceans would probably have formed at an earlier time
【正确答案】
B
【答案解析】
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