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
Without Bob's testimony, evidence of bribery is lacking and ______ in the case will be impossible.
A．verdict
B．sentence
C．conviction
D．acquittal
单项选择题
The oil price rise reactivated the boom in commodity prices and ______ inflation, which reached an annual rate of 15 per cent in the spring of 1974.
A．boosted
B．harnessed
C．staggered
D．embarked
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