单项选择题

Pupils often want to sit next to their particular friend and many classroom activities involve moving about, but even relatively snail alterations can make ______ to the visual comfort of pupils with sight defects.

A．a difference
B．an interference
C．a modification
D．an impact
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单项选择题
Most of them had visited the invalid often during the past few months, marveling at his ______ spirit and his unfailing good temper.
A．variant
B．gallant
C．pertinent
D．solitary
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