Questions 6 to 10 are based on the following news. A、It is a serious endemic disease in some areas of northwestChinA、
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 ofChinA、 D、It is regarded by scientists as the most common cause of preventable mental retardation and brain damage.
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