18. A biologist does not merely describe organisms, but tries to learn _____

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18. A biologist does not merely describe organisms, but tries to learn ______ act as they do.
(A) what causes them to
(B) causes them to what
(C) what causes the
(D) which causes the

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下一篇 : (33-34) 　　One hot summer afternoon, a rabbit went down to a river to drink some water.He saw himself

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