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3.联轴器的作用是（ ）。
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Listen to a short passage concerning American dating and fill in the missing information.Before marriage, younger Americans date each other, that is, they often go out together. Casual dating usually begins in the early teens, and in the late teens a _______ of steady dating develops. There is a great _________ that one goes to a dance with one person, to a football game with another, and to a picnic with a third.
Sometimes two couples go out together. This is known as “ ______ dating”. Group dating is also ________ among young people. Large groups of boys and girls may _________ together. Young people may go out together for a long time, which is, ________, a public statement of their ________ to marry. Men and women go out together ___________ especially those in cities.
This is “adult dating”. They ski together, dine together, either at restaurants or in each other’s homes. The American dating _______ is a rather casual one. Often young Americans who hardly know each other go out on dates. It is also __________ for them to arrange a “blind date”, that is, a date between two young people who have not met before.
1.发生压疮的最主要的原因（）
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