单项选择题

If you plant two apple trees in one square yard of land, and the trees' productivity () decline.

A. is bound to
B. is determined to
C. is unlikely to
D. is related to

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单项选择题
Some people () in part the defeat of the revolution in France and Germany to the English diplomacy, do you agree

A. contributed
B. attributed
C. distributed
D. owned
单项选择题
Small children can not () the difference between right and wrong. It is our duty to teach them.

A. appreciate
B. enjoy
C. acknowledge
D. confess
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