单项选择题

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.

A. manipulate
B. stipulate
C. regulate
D. observe

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单项选择题
They ______ themselves ______ the politician because they hoped he would become president one day. At last he did.
A. connected, with


B. combined, with
C. linked, up



D. attached, to
单项选择题
This village which is surrounded by mountains is only () by river, and it is obvious that the transportation is inconvenient.

A. accessible
B. attainable
C. available
D. achievable
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