单项选择题

A．He rarely noticed when students are late.
B．He is usually punctual.
C．He advised his students to wear watches to class.
D．He has been unpredictable.
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单项选择题
A．Storms and floods.B．Disease and fire.C．Rapid increase of the animal population.D．Less space for their growth.
A．Storms and floods.
B．Disease and fire.
C．Rapid increase of the animal population.
D．Less space for their growth.
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