The threats to the health of astronauts in space are very different from ______ on earth.
A．onesB．thatC．itD．those
D
考察代詞用法。One指代可數(shù)名詞單數(shù)，表泛指；that指代可數(shù)名詞單數(shù)或者不可數(shù)名詞，后面有定語(yǔ)修飾，表特指。It指代上文出現(xiàn)的同一事物。Those指代可數(shù)名詞復(fù)數(shù)，后面有定語(yǔ)修飾，表示特指。本題的those="the" threats，后面有on earth修飾。結(jié)合句意可知D正確。句意：在太空中對(duì)宇航員健康的威脅不同于地球上的威脅。
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