阿基米德定律指出：浸大液体里的物体受到向上的浮力，浮力的大小等于（）的质量。

A.物体

B.液体

C.被物体排开的液体

D.浸在液体中物体

Wang Ping is one of the best students who _____ from Beijing University. She studied politics, which _____ the

study of the ways in which a country is governed. [ ]

A. has graduated; are

B. have graduated; are

C. have graduated; is

D. has graduated; is.