Manmade fibers have only been used to make【B1】______for a little over a cen

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问题 Manmade fibers have only been used to make【B1】______for a little over a century, but their use is quite【B2】______nowadays. Rayon, the first manmade fiber commercially produced in the United States, appeared in 1910. In 1939, nylon, the first chemically【B3】______fiber, was first produced in this country on a commerical basis. Ever since, the number of manmade fibers has【B4】______into including more than 20 types.
Although the【B5】______of manmade clothing fibers is long, rayon remains one of the most popular of all time, and that is why we continue to produce it in such great【B6】______. Rayon is made of cellulose, a naturally occurring【B7】______found in cotton and in certain vegetables, like celery, of all things. The cellulose in rayon has been recycled and treated to make it a useful fiber for clothing.
【B8】______. Most rayon washes well, too, although it does shrink when it is washed in hot water.
【B9】______. It wouldn’t be a good idea to leave a red rayon dress to dry by a sunny window. If you did that for very long,【B10】______.
If you’ll just step this way. I’d like to【B11】______. [br] 【B7】

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