单项选择题

Apple trees are considered mature when they begin ________ fruit.

A．having
B．bearing
C．producing
D．making
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单项选择题
They have always regarded a man of ________ and fairness as a reliable friend.
A．integrity
B．dishonesty
C．happiness
D．honest
单项选择题
Language is a city，to the building of _______ every human being has brought a stone．
A．which
B．that
C．it
D．what
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