The threats to the health of astronauts in space are very different from ______ on earth.


  1. A.
    ones
  2. B.
    that
  3. C.
    it
  4. D.
    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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科目：高中英語 來源： 題型：閱讀理解

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閱讀下列短文，從每題所給的四個(gè)選項(xiàng)（A、B、C和D）中，選出最佳選項(xiàng)。
A
Fifty years from now the world’s population will be declining, with no end in sight. Unless people’s values change greatly, several centuries from now there could be fewer people living in the entire world than live in the United States today. The big surprise of the past twenty years is that in not one country did fertility (生育能力) stop falling when it reached the replacement rate（出生率）—2.1 children per woman. In Italy, for example, the rate has fallen to 1.2. In Western Europe as a whole and in Japan it is down to 1.5. The evidence now indicates that within fifty years or so world population will peak at about eight billion before starting a fairly rapid decline.
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