单项选择题

We must be aware that reading is a ______ tool of learning in higher education.

A．basic
B．basis
C．base
D．basics
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单项选择题
He is a good-natured man, but there is a limit to his ______.
A．patient
B．patience
C．impatient
D．impatience
单项选择题
He may act tough, but ______ he is a kind person.
A．from nature
B．by nature
C．through nature
D．out nature
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