单项选择题

It is a legal（）for parents to ensure that their children are provided with efficient education suitable to their age.

A. sympathy
B. obligation
C. impulse
D. influence

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单项选择题
Farmers are allowed to grow small gardens of their own and they sell their vegetables（）the black market.

A. on
B. at
C. in
D. for
单项选择题
Jack is so（） to his appearance that he never has his clothes pressed.

A. adverse
B. anonymous
C. indifferent
D. casual
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