单项选择题

The idea was just beginning to______in America and we knew that it was going to become the way that retailing companies were run.

A．show up
B．catch on
C．open out
D．get by
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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
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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