The limits of a person’s intelligence, generally speaking, are fixed at birth, but ________he reaches these limits will depend on his environment.
A．where B．whetherC．thatD．why
B

試題分析：考查名詞性從句作主語。句意：一個人的智商的限度，基本上在出生時就固定了；但是他是否能發(fā)揮自己的智力極限將取決于他所處的環(huán)境。But后面的句子有個主語從句，主語從句中不缺主賓表，不能用what，that只是連接，沒有意義，不做成分，where意思不對，選B。
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