题目内容
The United States is well known for its network of major highways designed to help a driver get from one place to another in the shortest possible time.【C1】______these wide modern roads are generally【C2】______ and well maintained, with【C3】______sharp curves and many straight【C4】______, a direct route is not always the most【C5】______one. Large highways often pass【C6】______scenic areas and interesting small towns. Furthermore, these highways generally【C7】______large urban centers which means that they become crowded with【C8】______traffic during rush hours,【C9】______the "fast, direct" routes becomes a very slow route.
However, there is【C10】______always another route to take【C11】______you arc not in a hurry. Not far from the【C12】______new "superhighways", there are often older,【C13】______heavily traveled roads which go through the countryside【C14】______of these are good two-lane(双车道) roads while others are uneven roads【C15】______ through the country. These secondary routes may go up steep slopes, along high【C16】______, or down frightening hillsides to towns【C17】______in deep valleys. Through these less direct routes, longer and slower, they generally go to places【C18】______the air is clean and the scenery is beautiful, and the driver may have a 【C19】______to get a fresh, clean【C20】______of the world.
【C1】
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As a pregnant woman drinks alcohol, the alcohol is passed into her bloodstream almost simultaneously. Moreover, because the bloodstream of the fetus is inseparably 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 (how developed it is depends on its stage of development). 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 as little as one drink of alcohol can produce significant, irreversible damage to the 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.
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