单项选择题

According to the weather report, the pollution index was________.

A．very good
B．good
C．fair
D．poor
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What happened during the accident
A．A train hit another train.
B．A train killed 23 people.
C．A train went off its tracks.
D．A train was trapped inside the station.
单项选择题
How should cheerleading be viewed according to the passage
A．It is just a lot of cheering.
B．It mainly involves yelling.
C．It mainly involves dancing.
D．It is competitive in nature.
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