单项选择题

According to the passage, when are children first expected to study hard

A．Before 6 years of age.
B．Between 6 and 10.
C．After 10 years of age.
D．After 12 years of age.
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单项选择题
About ________cars and dogs are destroyed each year.
A．6 million
B．15 million
C．30 million
D．1 million
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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