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
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单项选择题
However, growth in the fabricated metals industry was able to ______ some of the decline in the iron and steel industry.
A．overturn
B．overtake
C．offset
D．oppress
单项选择题
Although they plant trees in this area every year, the tops of some hills are still ______.
A．blank
B．hollow
C．vacant
D．bare
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