问题详情

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.请帮忙给出正确答案和分析，谢谢！