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
考查名詞性從句。句意：在他的書里，他即解釋了科學(xué)家的意義又說明了科學(xué)是如何的運作的。前空為意味作----，what的含義；后空work為不及物動詞，故用how.
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