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题目类型：[单选]
[单选] More has been learned since 1945 about the chemical changes in the body than in all human hist
A
in
B
that
C
which
D
the
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正确答案：
试题难度：
参考解析：
这里指的是在1945年之前的那个时期，并有强调之意。选项B是正确的。【句子大意】自从1945年以来，我们对人体化学变化的了解比1945年之前的整个人类历史所了解的还要多。
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