Scientists estimate that about 530, 000 objects, too small to detect with radar,

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问题 Scientists estimate that about 530, 000 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

解析本题考查句子结构。句意：科学家估计，大约有53万太小而雷达监测不到的物体在围着地球转。所选内容在that引导的宾语从句中作谓语，再根据句意，物体围绕地球转应用主动语态，所以本题选B。

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