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听力原文：According to Glazebrouk and Baldry, what was the color of the universe？
(28)

A. Light green.
B. Milky white.
C. Dark blue.
D. Colorless.

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微分方程yy'=1的通解为

A. y=x2+C
B. y2=x+C
C. 1/2y2=Cx
D. 1/2y2=x+C

【B15】

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

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