单项选择题

I don't quite follow what she is saying.

A．believe
B．understand
C．explain
D．accept
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单项选择题
Gambling is lawful in Nevada.
A．popular
B．booming
C．legal
D．profitable
单项选择题
These programmes are of immense value to old people.
A．natural
B．fatal
C．tiny
D．enormous
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