单项选择题

There are fast buses, double-decker buses, air-conditioned or heated buses ______ a good service.

A．all to offer
B．all are offering
C．all offering
D．all offered
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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
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
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