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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For a long time in that vast region, this law was in abeyance.
A. active use

B. doubt
C. discussion

D. disuse
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The manager just ______ his resignation to the board meeting yesterday and today another one took his place.
A. sent up
B. sent off
C. sent out
D. sent in
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