单项选择题

A．Calling someone.
B．Attending a concert.
C．Waiting in line.
D．Canceling reservation.
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单项选择题
A．He visited his friends in Pennsylvania.B．He went out for a picnic.C．He went to a concert.D．He went to a formal dinner.
A．He visited his friends in Pennsylvania.
B．He went out for a picnic.
C．He went to a concert.
D．He went to a formal dinner.
单项选择题
A．Smoking.B．Coughing.C．Air pollution.D．Air conditioner.
A．Smoking.
B．Coughing.
C．Air pollution.
D．Air conditioner.
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