单项选择题

A small car is more ________ than a large car, because it uses less petrol.

A．economical
B．economic
C．thrifty
D．advantageous
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单项选择题
Al said that he wouldn't mind _______.
A．to wait for us
B．walling for us
C．wait for us
D．for waiting us
单项选择题
While we axe making more use of nuclear power to meet the energy demand we should never neglect the _______ effect it can have on our living environment.
A．contrary
B．positive
C．negative
D．extensive
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