单项选择题

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

A．wearing
B．treading
C．falling
D．cutting
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单项选择题
The custom is ______ in the belief that a new pregnancy--through its detrimental effect on breastfeeding--would endanger the mother's health.
A．celebrated
B．observed
C．viewed
D．presented
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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