单项选择题

The house was very quiet, ______ as it was on the side of a mountain.

A．isolated
B．isolating
C．being isolated
D．having been isolated
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单项选择题
The timber rattlesnake is now on the endangered species list, and is extinct in two eastern states in which it once______.
A．thrived
B．swelled
C．prospered
D．flourished
单项选择题
It is naive to expect that any society can resolve all the social problems it is faced with ______.
A．for long
B．in and out
C．once for all
D．by nature
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