单项选择题

When the violinist finished his performance, the audience stood up and ____for five minutes.

A．acted
B．clapped
C．backed
D．closed
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单项选择题
Do you know the girl____father died in a car accident last week
A．who
B．that
C．whom
D．whose
单项选择题
Americans reuse about（）million computers each year.

A．5
B．10
C．15
D．20
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