单项选择题

All the key words in the article are printed in ______ type so as to attract readers' attention.

A．dark
B．dense
C．black
D．bold
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单项选择题
I didn't ______ to take a taxi but I had to as I was late.
A．assume
B．suppose
C．mean
D．hope
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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