单项选择题

In the background was that eternal hum.

A．long
B．never-ending
C．boring
D．extensive
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单项选择题
Loud noises can be irritating.
A．hateful
B．painful
C．stimulating
D．annoying
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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