单项选择题

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

A．wearing
B．treading
C．failing
D．cutting
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单项选择题
The bishop preached a farewell sermon to a ______ that filled the church to overflowing.
A．procession
B．reunion
C．rally
D．congregation
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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