单项选择题

How much will the 3 books cost all together（）

A．$1.75.
B．$2.50.
C．$1.50
D．$1.15.

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单项选择题

The Weather Bureau has repeatedly advised the people to take every （）against the coming typhoon.

A．protection
B．precaution
C．prevention
D．prediction

单项选择题

（）I saw the machine, I could not have imagined how efficiently it works.

A．But for
B．Because
C．But that
D．If

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