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  3. Although most universities in the United States are on a semester system which offers classes in the fall and spring, some schoo

Although most universities in the United States are on a semester system which offers classes in the fall and spring, some schoo

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问题 Although most universities in the United States are on a semester system which offers classes in the fall and spring, some schools ______ a quarter system comprised of fall, winter, and summer quarters.
选项 A、manipulate
B、stipulate
C、regulate
D、observe
答案D
解析 本题中，D项“observe遵守”符合题意，如：observe a rule(遵守规则)。其他三项“A项manipulate操作，利用；B项stipulate规定，保证；C项regulate管制，调节”都不正确。因此D项为正确答案。
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