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The primary focus of the passage is on which of the following? According to the passage, why do the dust particles in a meteor
The primary focus of the passage is on which of the following? According to the passage, why do the dust particles in a meteor
admin
2009-04-18
92
问题
The primary focus of the passage is on which of the following?
According to the passage, why do the dust particles in a meteor stream eventually surround a comet’s orginla orbit?
选项
A、They are ejected by the comet at differing velocities.
B、Their orbits are uncontrolled by planetary gravitational fields.
C、They become part of the meteor stream at different times.
D、Their velocity slows over time.
E、Their ejection velocity is slower than that of the comet.
答案
A
解析
This question asks for the reason given in the passage for a characteristic feature of meteor streams. According to lines 1-7, the dust particles in a meteor stream eventually surround a comet’s original orbit because of the different velocities at which they are ejected, as stated in choice A, the best answer. Choice B is directly contradicted by information in the passage (lines 8-10). The other answer choices re incorrect because the passage does not say that the dust particles become part of the meteor stream at different times, or that their velocity slows over time, or that their ejection velocity is slower than that of the comet.
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