单项选择题

24（）

A．in express
B．to expressing
C．in expressing
D．to express

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单项选择题

In order to use the water from the stove, there （）be a pipe connecting the tub with the stove.

A．must
B．seemed to
C．needn’t
D．should

单项选择题

It can be learned from the passage that about four billion years ago （）.

A．the earth was in molten state
B．the earth surface temperature was above 100℃
C．the earth surface temperature was below 100℃
D．rain water could remain on the earth