下面有3篇短文，每篇短文后有5道题，每题后面有4个选项。请仔细阅读短文并根据短文回答其后面的问题。 第一篇 Multivitamins Urged
for All Pregnant Women 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 Organization
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
new study took place in Dar es Salaam. 4,200 pregnant women received
multivitamins. The pills contained all of the vitamins in the B group along with
vitamins C and E. They also contained several times more iron and folate than
the levels advised for women in developed nations. Pregnant women especially in
poor countries may find it difficult to get enough vitamins and minerals from
the foods in their diet. 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. 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 body’s
immunity against infection. The new study in pregnant women who
were not infected with the AIDS virus found that multivitamins reduced the risk
of low birth weight. Just under eight percent of the babies born to women who
took the multivitamins weighed less than 2,500 grams. The rate was almost nine
and one-half percent in the group of women who received a placebo, an inactive
pill, instead of the vitamins. But the vitamins did not do much to reduce the
rates of babies being born too early or dying while still a fetus. Still, the
researchers say multivitamins should be considered for all pregnant women in
developing countries. 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.