单项选择题

He asked us to （） them in carrying through their plan.

A．provide
B．arouse
C．assist
D．persist

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单项选择题

It can be inferred from the passage that the shell should be（）

A．fancy-looking
B．waterproof
C．easily breakable
D．extremely strong

单项选择题

The main function of the shell is（）

A．to strengthen the pilings of the house
B．to give the house a better appearance
C．to protect the wooden frame of the house
D．to slow down the speed of the swelling water