2. 外语
  3. Scientists estimate that about 530,000 other objects, too small to detect with radar,________the Earth too.

Scientists estimate that about 530,000 other objects, too small to detect with radar,________the Earth too.

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问题 Scientists estimate that about 530,000 other objects, too small to detect with radar,________the Earth too.
选项 A、being circled
B、are circling
C、are to be circling
D、are being circled
答案B
解析 科学家预计有53万个小到雷达无法探测到的其他物体也在围绕着地球旋转。本题考查现在分词。本句用现在分词短语作伴随状态，说明这些物体的状态，故选B。
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