单项选择题

Color-blind people often find it difficult to ___________ between red and green.

A．identify
B．distinguish
C．separate
D．compare
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单项选择题
During their first teacher-training year, the students often visited local schools for the ___________ of lessons.
A．investigation
B．inspection
C．repetition
D．observation
单项选择题
She was an ___________ writer because she persuaded many people to see the truth of her ideas.
A．influential
B．ordinary
C．enthusiastic
D．outstanding
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