2. 外语
  3. (Practical) problems limit the (ability) of astronomers to determine the mass of asteroids,(who) are small planetary bodied (orb

(Practical) problems limit the (ability) of astronomers to determine the mass of asteroids,(who) are small planetary bodied (orb

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问题 (Practical) problems limit the (ability) of astronomers to determine the mass of asteroids,(who) are small planetary bodied (orbiting) the Sun.
选项 A、Practical
B、ability
C、who
D、orbiting
答案C
解析
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