题目

The cruel mother________at the poor daughter repeatedly with a stick because she didn't do well in her studies. A.beat       B.hit C.struck         D.knocked   答案:C四个选项中,beat指连续敲打,hit指击中,两个词都常作及物动词;knock at是“敲打”的意思,根据该句的语境,用木棍打某人,应该用strike。 水在生物体的许多化学反应中充当: [  ] A. 溶剂 B. 催化剂 C. 载体 D. 还原剂
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