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 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
Did he really expect her to smile now and ______ with his plans, treat all this deception as no more than an unusual diversion
A．fall in
B．put off
C．agree to
D．stand up
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