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【单选题】

(Practical) problems limit the (ability) of astronomers to determine the mass of asteroids,(who) are small planetary bodied (orbiting) the Sun.
A．Practical

B．ability
C．who
D．orbiting
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根据网考网移动考试中心的统计，该试题：

0%的考友选择了A选项

16%的考友选择了B选项

83%的考友选择了C选项

1%的考友选择了D选项

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