In his book,he explains both ______ it means to be a scientist and ______ science works.

A.how; how                                                                       B.what; that

C.what; how                                                                     D.how; that

C


解析:

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(shuō)明了科學(xué)是如何的運(yùn)作的。前空為意味作----，what的含義；后空work為不及物動(dòng)詞，故用how.

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