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
The first English dictionary was published________.
A．1604
B．around 1700
C．1750
D．1755
单项选择题
Vincent solved his problem by_________.
A．going directly to the boss.
B．talking to his parents.
C．asking his mother to speak to his boss.
D．telling his boss’’s mother about it.
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