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单选题

A．Since the kindergarten.
B．Since the primary school.
C．Since the middle school.
D．Since the high school.

参考答案B

解析: When does the gap appear?
推断题。根据文中提到的Poor white children are already lagging behind when they start primary school， and the gap grows wider as they get older．(贫困的白人家的孩子在开始上小学时就已经落在后面了。并且随着他们长大差距会越来越大。)可以知道差距是从小学开始的。因此，正确答案为B。

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单选题

A．Improvements of children's achievements in school can be made.
B．Children's heath can be improved.
C．The school needs to care more about children's special talents.
D．The educational system can be improved.

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单选题

A．Adding some science courses.
B．Recruiting more good teachers.
C．Build more labs.
D．Buying more teaching equipments.

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单选题

A．They fought with the other mice.
B．They stayed close to their mothers.
C．They ran back and forth constantly.
D．They remained close to one wall.

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