单项选择题

So little（）about chemistry that the lecture was completely beyond me.

A、 did I know
B、 I know
C、 do I know
D、 I knew

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Between 1975 and 1996, the number of overseas visitors expanded（）27% on average each year.

A、in
B、by
C、for
D、to
单项选择题
In the（）half of the 17th century those cities became even more prosperous.

A、 latter
B、 latest
C、 later
D、 late
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