单项选择题

I don't quite follow what she is saying.

A. observe
B. understand
C. explain
D. describe
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单项选择题
Of the reptile groups, the snake group was the final one to appear.
A. last
B. best
C. ugliest
D. longest
单项选择题
The oldest preserved manuscripts are those written on papyrus, which were found in Egyptian tombs.
A．protected
B．hidden
C．sought
D．discovered
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