题目内容：

阅读下面短文，从短文后各题所给的ABCD四个选项中，选出可以填入空白处的最佳选项。

It's hard to believe that a beautiful silk dress comes from thousands of very little worms (虫子)called silkworms! It takes about 5,500 silkworms to make 2.2 pounds of silk. The process (工序) was _______ by the Chinese about 5,000 years ago.

_______ is silk made? The process starts with silkworm eggs. The eggs are collected and kept warm. After a few days, silkworms come out of the eggs. They are_______ leaves from mulberry trees every 30 minutes, all night and all day. The room _______ be kept warm, without loud noises or bad smells. After a month, they start to make cocoons (茧). After four days, the cocoons are ________

The cocoons are heated (加热), and the silkworms are killed inside them. Then the cocoons are put into water to make the silk loose (松散的). The silk_______ three or four cocoons is put together and made into a thread (线). One cocoon can make a thread 1 kilometre long!_______, the silk threads are made into cloth, and the cloth is used for things like dresses, scarves and neckties.

Today, silk is produced in many _______, including India and Thailand, but more than 80 percent of the world's silk comes from China. Every year, enough silk thread is ______ to go from the earth to the sun 300 times. People love silk clothes because they are beautiful and _________--silk feels cool in warm weather and warm in cool weather. Now you know why silk is so expensive!

1.A. borrowed B. discussed C. mentioned D. discovered

2.A. How B. Why C. When D. Where

3.A. bought B. fed C. taken D. made

4.A. can B. must C. can't D. mustn't

5.A. late B. right C. ready D. over

6.A. for B. about C. with D. from

7.A. Immediately B. Finally C. Suddenly D. Recently

8.A. villages B. towns C. cities D. countries

9.A. wasted B. checked C. produced D. separated

10.A. soft B. bright C. expensive D. comfortable