单项选择题

I don't quite follow what she is saying.

A．observe
B．understand
C．explain
D．describe
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单项选择题
Gambling is lawful in Nevada.
A．enjoyable
B．irresistible
C．legal
D．profitable
单项选择题
Loud noises can be irritating.
A．hateful
B．painful
C．stimulating
D．annoying
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