D To increase the number of lymphocytes in mothers blood.
4. What a role do lymphocytes play in the human body?
A To reduce the rate of dying while still a fetus.
B To raise the bodys immunity against infection.
C To help prevent the development of heart disease.
D To help prevent the development of diabetes.
5. How many percent of babies were born with low birth weight to women who were not infected with the AIDS virus and took the multivitamins according to a new study?
A Less than8%.
B About 9.5%.
C 1.5%.
D 17.5%.
答案与题解:
1.C 第一段最后两句说到,WHO估计每年有2000万出生婴儿体重过低,其中十个中有九个生于发展中国家,可见发达国家只占十分之一,故应是200万。
2.D 文章第二段第二、三句已经说明,选项A、B、C均是多种维生素片所含的物质,只有D项没有提及,而且也不可能。
3.A 关于多种维生素制剂的作用,B项在第四段第二句提到,C项在第三段倒数第三句提到, D项在第三段最后两句提到,只有A项在第四段倒数第二句中提到它时却说维生素对它不起什么作用。
4.B 第三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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