单项选择题

A．seldom
B．rarely
C．often
D．occasionally
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单项选择题
A．Inner-city children.B．Minority children.C．Handicapped children.D．Rural children.
A．Inner-city children.
B．Minority children.
C．Handicapped children.
D．Rural children.
单项选择题
A．20%B．30%C．40%D．50%
A．20%
B．30%
C．40%
D．50%
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