单项选择题

The ink has faded with time and so parts of the letter were ______.

A．illegible
B．indelible
C．illegitimate
D．inscrutable
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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
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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