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问题 选择题
Why not _____ to the city?

A. go
B. going
C. to go
D. goes
答案

答案：A

选择题
The students were asked to copy the text as their homework, _____ from the second paragraph.

A. started
B. starting
C. to start
D. start
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选择题

在25℃浓度均为1mo l · L-1的(NH4)2SO4,  (NH4)2Fe(SO4)2, (NH4)2CO3溶液中,测得c(NH4＋)分别为a,b,c (单位mo l · L-1)则下列关系式正确的是(  ).

A   a=b=c

B   a>b>c

C   a>c>b

D   b>a>c
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