题目内容

In his book,he explains both ______ it means to be a scientist and ______ science works.
A．how; howB．what; that
C．what; howD．how; that
C
考查名词性从句。句意：在他的书里，他即解释了科学家的意义又说明了科学是如何的运作的。前空为意味作----，what的含义；后空work为不及物动词，故用how.
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