单项选择题

A．There are more people who use cars now than before.
B．More people use bikes for physical fitness.
C．More children are getting on using bikes.
D．Air pollution is a national problem.
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单项选择题
A．He is probably a teacher.B．He is probably a bus driver.C．He is probably a swimming trainer.D．He is probably a manager.
A．He is probably a teacher.
B．He is probably a bus driver.
C．He is probably a swimming trainer.
D．He is probably a manager.
单项选择题
A．They make some signs.B．They stay away from other birds.C．They keep silent,D．They hide themselves.
A．They make some signs.
B．They stay away from other birds.
C．They keep silent,
D．They hide themselves.
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