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Comets are now known to contain twice as many atoms of deuterium to each atom of ordinary hydrogen found in seawater. Sc
Comets are now known to contain twice as many atoms of deuterium to each atom of ordinary hydrogen found in seawater. Sc
admin
2011-01-17
25
问题
Comets are now known to contain twice as many atoms of deuterium to
each atom of ordinary hydrogen found in seawater. Scientists have also
discovered that meteorites could not solely have delivered the water in the
Line ocean, for then the earth’s atmosphere would contain nearly 10 times as much
(5) xenon as it actually does, given that meteorites carry excess xenon. Hence, the
best model for the source of the oceans at the moment is a combination of water
derived from comets and water caught up in the rocky body of the earth as it
formed. This mixture satisfies both the xenon and deuterium problem, the
latter especially if the rocky material out near the earth’s present orbit
(10) collected some regularly composed local water from the solar nebula before they
accreted to form the earth. New laboratory studies have indicated that the
water vapor in the solar nebula would have had a low enough proportion of
deuterium to complement the excess deuterium found in comets.
Which of the following, if true, would cast the MOST doubt on scientists’ most recent explanation for the origin of the ocean’s water?
选项
A、Meteorites contain only twice, and not ten times as much xenon as regular sea water.
B、Local water from the solar nebula is found to contain as much xenon as meteorites.
C、Water from the solar nebula contains less deuterium than was previously thought.
D、Comets containing more than twice the amount of deuterium than was previously thought.
E、More than twice as many meteorites as comets existed in the solar system at the time of the Earth’s formation.
答案
B
解析
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本试题收录于:
GRE VERBAL题库GRE分类
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GRE VERBAL
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