A recent study in Tanzania found that when pregnant women took vitamins every day, fewer babies were born too small. Babies that weigh less than two and one-half kilograms at birth have a greater risk of dying. Those that survive are more likely to experience problems with their development. And experts say that as adults they have a higher risk of diseases including heart disease and diabetes. The World Health Organization1 estimates that every year twenty million babies are born with low birth weight. Nine out of ten of them are born in developing countries.
The scientists compared the findings with results from a group of 4,000 women who did not receive the vitamins. A report by the scientists, from the United States and Tanzania, appeared in the New England Journal of Medicine. 3 Wafaie Fawzi of the Harvard University School of Public Health4 led the study. None of the women in the study had HIV, the virus that causes AIDS. The scientists reported earlier that daily multivitamins were a low-cost way to reduce fetal deaths in pregnant women infected with5 HIV. The earlier work in Tanzania also found improvement in the mothers in their number of blood cells known as lymphocytes. Lymphocytes increase the bodys immunity against infection.
练习:
A 20,000,000.
C 2,000,000.
2. A pill of multivitamins may contain all of the following substances EXCEPT
B vitamins C and E.
D antiviral substances.
A To reduce the rate of babies born too early.
C To reduce fetal deaths in pregnant women infected with HIV.
4. What a role do lymphocytes play in the human body?
B To raise the bodys immunity against infection.
D To help prevent the development of diabetes.
A Less than8%.
C 1.5%.
答案: C,D,A,B,A
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