题目内容

【B15】

A. so
B. to
C. as
D. such

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设x2是f(x)的一个原函数，则f(x)=

A. 2x
B. x3
C. (1/3)x3+C
D. 3x3+C

The passage mainly discusses the factors leading to plastic bag pollution..

A. Y
B. N
C. NG

核左移时，血常规的变化应为（）E．

It is estimated that about one hundred thousand sea animals were killed by discarded plastic bags.

A. Y
B. N
C. NG