________ 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(yǔ)從句，句義：和人類(lèi)一樣，很多動(dòng)物在年幼睡覺(jué)時(shí)間多，長(zhǎng)大以后就睡得少了。引導(dǎo)非限制性定語(yǔ)從句時(shí)候，as可以放在句首，或者主語(yǔ)之后，which不放在句首，BD兩項(xiàng)不能指代全局。故C正確。
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