The threats to the health of astronauts in space are very different from ______
题型：不详难度：来源：
| The threats to the health of astronauts in space are very different from ______ on earth. |
答案
| D |
解析
| 考察代词用法。One指代可数名词单数，表泛指；that指代可数名词单数或者不可数名词，后面有定语修饰，表特指。It指代上文出现的同一事物。Those指代可数名词复数，后面有定语修饰，表示特指。本题的those="the" threats，后面有on earth修饰。结合句意可知D正确。句意：在太空中对宇航员健康的威胁不同于地球上的威胁。 |
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