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One of the most dangerous drugs for pregnant women to consume is alcohol. Be
One of the most dangerous drugs for pregnant women to consume is alcohol. Be
游客
2025-03-10
27
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问题
One of the most dangerous drugs for pregnant women to consume is alcohol. Because alcohol is delivered quickly into the blood and passes quickly into the tissues and membranes, the human fetus(胎儿)is particularly vulnerable to its effects. In fact, the negative effects on a fetus are so pronounced that babies born after exposure to alcohol are said to be suffering from fetal alcohol syndrome.
As a pregnant woman drinks alcohol, the alcohol is passed into her bloodstream almost simultaneously. Moreover, because the bloodstream of a fetus is inextricably tied to that of the mother, the alcohol passes directly into the bloodstream of the fetus as well.
And, what is more, the concentration of alcohol in the fetus is exactly the same as in the mother. For the mother, this concentration is not a problem because her liver can remove one ounce of alcohol from her system per hour. However, the fetus’ s liver is not completely developed. The rate at which it is able to eliminate the alcohol from the blood of the fetus is much slower.
Eventually, the alcohol will be returned to the mother’ s system by passing across the placenta(胎盘), but this process is slow. By the time this takes place, major neurological damage may have already occurred. Research has shown that little as one drink of alcohol can produce significant, irreversible damage to fetus.
Babies born after exposure to alcohol generally exhibit facial distortion, inability to concentrate and difficulty in remembering. Simply speaking, it is imperative that pregnant women avoid alcohol. [br] In Para. 2 the word "inextricably" most nearly means______.
选项
A、unexplained
B、formerly
C、forcefully
D、inseparably
答案
D
解析
语义辨析题。定位句介绍酒精几乎同时进入母体与胎儿的血液中,说明孕妇的血流与胎儿的血流是紧密相连的,即inextricably,故选D。
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