跟踪导练（一）（3）

阅读理解

Once Wilhelm K. Roentgen and several other scientists were experimenting with passing electric currents through certain gases in a special glass tube （管子） from which the air had been taken away. Then one day Roentgen noticed that though the tube was covered with black paper， some strange kind of radiation were coming through and making a screen nearby give out light. Roentgen could see nothing out of the tube. But then he discovered that if he put the screen in the next room on the other side of the closed door， the rays still seemed to affect it. The screen showed that the rays could pass not only through the black paper but also through wood.

The next thing he found out was that if he put his hands between the rays and a photographic plate， the rays would print a shadow of the bone framework （骨架） of his hands on the plate. In fact， the rays could pass as easily through the fleshy （肉的） part of his hand as through the black paper， but hardly at all through the bone. So Roentgen made the first X-ray picture of a hand showing just how the bones in the hand fitted together.

Roentgen called these unknown rays X-rays， but other scientists called them Roentgen rays in honor of the man who first found them.

1. What was in the special glass tube？

A. Air. B. Water.

C. Gases. D. Nothing.

2. According to this passage， Roentgen discovered X-rays ___ .

A. by accident

B. by working hard

C. by doing lots of experiments

D. with the help of several other scientists

3. What can X-rays hardly pass through？

A. Wood. B. Bones.

C. Flesh. D. Black paper.

4. Whats the best title of the passage？

A. The Discovery of X-Rays

B. The First X-ray Picture of A Hand

C. The Discovery of Electric Currents

D. The Use of Rays and Photographic Plates

选词填空

从下列方框里10个单词中选择8个适当单词的正确形式填入下列各句中，使其句意完整。每个单词只使用一次。

educate nickname publish convert producer

agriculture figure producer staple biology

1. Billy has a degree in ____ .

2. Better methods of ____ are needed to feed the worlds population.

3. A（n） ____ in a blue dress appeared in the doorway.

4. The ____ of anything， that is， the person who makes or grows it， should be responsible for it.

5. You should ____ your children to behave well.

6. Rice is the ____ food of half the worlds population.

7. Her profession is collecting information and ____ it.

8. A television set ____ electric energy into sound and light energy.

句子翻译

1. 科学种田是农业发展的关键。

2. 由于他愚蠢的行为，他失去了所有的朋友。

3. 比尔出生在加拿大，但在美国长大。

4. 我可以说世界上没有什么东西可以取代母亲的爱和关心。

单项选择

1. A foreign expert was ___ to give us a speech on how to learn biology well.

A. brought out B. brought on

C. brought in D. brought up

2. After lots of experiments， some scientists have made an exciting ___ in the treatment of many diseases.

A. breakdown B. breakup

C. breakthrough D. breakout

3. This bedroom is going to be ___ to a toilet.

A. converted B. exchanged

C. referred D. shaped

4. We all know that Gibert ___ electricity， and Bell ___ the telephone.

A. discovered； discovered B. discovered； invented

C. invented； discovered D. invented； invented

5. — What about the price of this material now？

— It has been ___ 9 percent since the middle of this year.

A. increased to B. risen to

C. increased by D. risen by

6. ___ you put your heart and energy into what you do， youll feel ___ in it.

A. Once； interesting B. Unless； interested

C. If； interested D. When； interesting

7. Her parents died in the car accident when she was still a baby， so she was not ___ by her parents.

A. brought up B. taken up

C. grown up D. fed up

8. Mr White， who was a manager of this company， has ___ Mr Kate as the CEO.

A. took B. replaced

C. covered D. put

9. — Thats my sister when she graduated from high school. See

what she looks like now！

— Doesnt she think that she is a little fat？ Why doesnt she do

regular exercise to improve her ___ ？

A. figure B. form

C. body D. manner

10. Its certain that more than half the students in that school ___ abroad to study in the past two years.

A. was sent B. were sent

C. had sent D. are sent