单项选择题

A．teen pregnancy and difficulty in school.
B．low self esteem and poor nutrition.
C．difficulty in school and physical abuse.
D．illiteracy and teen pregnancy.
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单项选择题
A．swim in public pools.B．give blood.C．over exert yourself.D．expose your skin to the sun.
A．swim in public pools.
B．give blood.
C．over exert yourself.
D．expose your skin to the sun.
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