题目

单项选择 Mr. Smith is ______ old man and he usually walks with his dog after______ supper. A. a; the    B. an; a     C. an; /    D. the; / 答案:C下列说法不正确的是 [  ] A.的系数是-1,次数是4 B.是整式 C.的项是,-3x,1 D.是三次二项式
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