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  3. How many babies are born with low birth weight in the developed countries every year according to WHO? What a role do lymphocyt

How many babies are born with low birth weight in the developed countries every year according to WHO? What a role do lymphocyt

admin2009-06-15  47
问题 How many babies are born with low birth weight in the developed countries every year according to WHO?
What a role do lymphocytes play in the human body?
选项 A、To reduce the rate of dying while still a fetus.
B、To raise the body’s immunity against infection.
C、To help prevent the development of heart disease.
D、To help prevent the development of diabetes.
答案B
解析 第二段最后一句是文章中唯一一句说明淋巴细胞在身体中的作用的句子，故是正确答案，其他A、C、D三项都与淋巴细胞无关。
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