单项选择题

Which of the following can best express the main idea of the passage（）

A．Never be satisfied with what you have.
B．Start a business as a customer.
C．It is profitable to find fault with what you have.
D．To start a business is to make a fortun

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单项选择题

Dawson was dissatisfied with soft iron pitons because（）

A．they were too soft to bear the climber's weight
B．they were the only pitons he could afford to buy
C．they coul not last long
D．they were made of iron

单项选择题

Motoring organizations, are now offering motorists （）

A．a discount for becoming members
B．a box which fits nearly into most car
C．a selection of parts which may be needed
D．a chance to rent a car cheaply