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.