2. 专升本
  3. More have been learned since 1945 about chemical changes in the body than in all human history before______time.

More have been learned since 1945 about chemical changes in the body than in all human history before______time.

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问题 More have been learned since 1945 about chemical changes in the body than in all human history before______time.
选项 A、this
B、the
C、the past
D、that
答案D
解析 句意：自1945年以来所了解的人体内的化学变化比之前整个人类历史所了 解的都多。词义辨析题。因为指示代词that通常前指，即指代前面的时间1945年，而this 通常后指，the past范围太广，本题主要指前面提到的那个时间以前。故答案为D。
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