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. whether
C. that
D. why
网友回答
A. where
(答案→)B. whether
C. that
D. why
解析：考查名词性从句作主语。句意：一个人的智商的限度，基本上在出生时就固定了；但是他是否能发挥自己的智力极限将取决于他所处的环境。But后面的句子有个主语从句，主语从句中不缺主宾表，不能用what，that只是连接，没有意义，不做成分，where意思不对，选B。