单项选择题

It is reported that the latest outbreak of the bird flu in Pennsylvania in the United States has prompted China to slap a ban on poultry imports from the state.

A．marine products
B．dairy products
C．industrial products
D．avian products
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单项选择题
Research should continue on controlled nuclear fusion, but no energy program should be premised on its existence until it has proved practical.
A．focused
B．concentrated
C．agreed
D．based
单项选择题
He displayed a complete lack of courtesy and tact in dealing with his employer.
A．tenacity
B．curiosity
C．civility
D．hostility
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