单项选择题

Reasons for careful teaching range from preventing a child ______ to keeping a child occupied.

A．sinking behind
B．falling behind
C．drawing behind
D．crawling behind
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单项选择题
The absent-mindedness of the boy is ______ of his lack of interest in the lesson.
A．evident
B．positive
C．indicative
D．revealing
单项选择题
We'll make no ______ between the terrorists and those who harbor them.
A．division
B．comparison
C．difference
D．distinction
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