单项选择题

A．Lack of clean water.
B．Lack of electricity.
C．Shortage of experts.
D．Shortage of books.
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单项选择题
A．How to keep fit.B．Common diseases caused by vitamins.C．Vitamins and our health.D．Vitamin in different kinds of vegetables.
A．How to keep fit.
B．Common diseases caused by vitamins.
C．Vitamins and our health.
D．Vitamin in different kinds of vegetables.
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