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
A．a large amount of money.B．a large plastic bomb.C．similar explosives.D．the bodies of many victims.
A．a large amount of money.
B．a large plastic bomb.
C．similar explosives.
D．the bodies of many victims.
单项选择题
The speaker’’s friend was ________.
A．a friend of the ruler
B．a tax collector
C．a government official
D．once a school teacher in India
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