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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What is NOT a change to the literature class
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C．Class length.
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From the news item, we are sure this was at least Rice’’s ________trip to Iraq.
A．first
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C．third
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