________ is often the case with human beings, many animals sleep a lot when young, but sleep much less when they get older.
A．WhichB．What
C．AsD．That
C
C 考察定語從句，句義：和人類一樣，很多動物在年幼睡覺時間多，長大以后就睡得少了。引導(dǎo)非限制性定語從句時候，as可以放在句首，或者主語之后，which不放在句首，BD兩項不能指代全局。故C正確。
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