单项选择题


A．easy
B．easier
C．difficult
D．difficulty
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单项选择题
A．occurB．occursC．occurringD．occurred
A．occur
B．occurs
C．occurring
D．occurred
单项选择题
A．attractB．absorbC．drawD．arouse
A．attract
B．absorb
C．draw
D．arouse
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