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A．It is a serious endemic disease in some areas of northwest China.B．It may lead to br

A．It is a serious endemic disease in some areas of northwest China.

B．It may lead to breast and prostate cancer.

C．It benefits 144,000 newborn babies and women of child-bearing age in eight counties and cities in some areas of China.

D．It is regarded by scientists as the most common cause of preventable mental retardation and brain damage.

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