单项选择题

But, in our enthusiasm to discover our heritage, we are ruining the very scenery we go to en joy, damaging natural habitats, ______ down footpaths, disturbing wildlife, polluting the air and drop ping litter.

A．wearing
B．treading
C．falling
D．cutting
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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
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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