In his book he explains both it means to be a scientist and science works.A. how; howB.

问题补充：

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

答案：

A. how; how

B. what; that

(答案→)C. what; how

D. how; that

解析：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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