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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Parcel Express needs the following details about the sender EXCEPT
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The man is speaking with________.
A．Dean Williams
B．Professor Brown
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