【題目】The threats to the health of astronauts in space are very different from __________ on earth.

A. ones

B. that

C. it

D. those

【答案】D

【解析】句意:對宇航員健康的威脅,太空中與地球上大不相同。those指代前文中的可數(shù)名詞復(fù)數(shù)threats。

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