注释：

1.        World Health Organization (WHO)：世界卫生组织

2.        along with：与…一起

3.        New England Journal of Medicine：新英格兰医药杂志。New England 是美国东北六州( Maine, Vermont, New Hampshire, Massachusetts, Rhode Island 和 Connecticut )的总称。

4.  Harvard University School of Public Health：哈佛大学公共卫生学院

5.  HIV ( human immunodeficiency virus )：人免疫缺陷病毒

6.  AIDS ( acquired immunodeficiency syndrome )：获得性免疫缺陷综合征，艾滋病

7.  (be) infected with：感染上…

练习：

1.  How many babies are born with low birth weight in the developed countries every year according to WHO?

A)  20,000,000.

B)  18,000,000.

C)  2,000,000.

D)  38,000,000.

2.  A pill of multivitamins may contain all of the following substances EXCEPT _________.

A)  all vitamins in the B group

B)  vitamins C and E

C)  much iron and folate

D)  antiviral substances

3.  Which of the following is NOT one of the effects of multivitamins mentioned in the passage?

    A)  To reduce the rate of babies born too early.

    B)  To reduce the risk of low birth weight.

    C)  To reduce fetal deaths in pregnant women infected with HIV.

    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 body’s 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 than 8%.

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，其它A、C、D三项都与淋巴细胞无关。

5.  A　第四段第一句和第二句已经将本题答案说得很清楚，其中的just under eight percent（只不足8 %）正是A 项的less than 8%。