【題目】Blue whales are the largest and heaviest animals in the world, but they _______ the smallest sea animals.
A.feed in
B.live in
C.feed on
D.fed on

【答案】C
【解析】feed on 是固定搭配，意為“以……為生”，故選C。句意是：藍鯨是世界上最大最重的動物，但是它們以最小的海洋動物為生。

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