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

Every school day, we use schoolbags to carry all of our things to school. They are a big part of our lives. But have you ever thought about the history of the schoolbag?

In the Han Dynasty (汉朝), students in old-style private schools used bamboo boxes to carry books to school. People consider the bamboo boxes to be the earliest schoolbags. They were usually two or three layers (层) in the box. Kids put different things like books, brushes, ink stones (砚) and paper in the boxes.

Hundreds of years later, people developed a new kind of schoolbag called the budai, or the "hip-pocket". The budai was lighter than the bamboo box. With the founding (成立) of the People's Republic of China, military rucksacks (军用帆布包) became popular. Many people carried them when they were in school. Ask your grandparents or parents about these bags. Maybe they can tell you about their experiences of carrying them when they were in school.

A new style of schoolbags has appeared in recent years. Many of them have colorful and fashionable designs (时尚的设计) on them, such as pictures of cartoons or pop stars. And they are more comfortable to use. Some students pull wheeled bags filled with heavy textbooks and others carry backpacks.

Schoolbags are still changing. Can you imagine what future schoolbags will be like?

1.Schoolbags in the Han Dynasty were made of _______.

A. cloth

B. paper

C. plastic

D. bamboo

2.Which is NOT true according to the passage?

A. Military rucksacks were popular in the 1950s.

B. The budai was heavier than the bamboo box.

C. There are some pictures on the new style of schoolbags.

D. Schoolbags have changed a lot.

3.To carry heavy textbooks, students would like to use _______.

A. wheeled bags

B. military rucksacks

C. bamboo boxes

D. the budai

4.We can usually read the article in ________.

A. a letter

B. a guidebook

C. a newspaper

D. a notice

5.The purpose of the article is ______.

A. to tell us how to use schoolbags

B. to explain why we use schoolbags

C. to introduce the importance of schoolbags

D. to introduce the development of schoolbags

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