Module 4 Great Scientists

跟踪导练（一）

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 from which the air had been taken away. Then one day Roentgen noticed that though the tube was covered with black paper， some strange kinds of radiation （辐射） 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 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. Paper.

2. According to this text， Roentgen discovered X-rays .

A. by accident      B. through his hard work

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. What can be the best title for the text？

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

阅读七选五

The best form of exercise is walking. Casual walk for thirty to forty minutes can do wonders for the body.1 Displayed below are reasons.

Help to burn calories （卡路里）.

A daily walk routine can help to burn calories. Walking for thirty minutes a day can help to burn about three to four hundred calories per day. A daily walk helps to burn 100 calories per mile.

2

Help to improve energy level.

There could be a possibility of drying up with other stressful forms of exercises. This is not possible with walking.3 With burning calories， it helps to stay active and fit throughout the day.

4

Walking helps to decrease the risk of health related diseases and infections. In fact， with weight loss it helps to maintain a normal heart rate. Walking burns fat and helps to strengthen the immune （免疫的） system of the body.

Help in planning.

5 It doesn't like gym and other types of exercises. There is no proper planning required for walking. The progress is easy to track; there are many smart apps which are available for walk and weight loss. It helps to keep a track on calories burned to lose weight.

A. Help to stay energetic.

B. Help to reduce health risks.

C. Walking doesn't cost much.

D. It is best to walk daily to keep a good body shape.

E. Walking is an easy way to exercise and benefits us a lot.

F. Walking helps in weight loss， and it improves your energy.

G. Starting a weight loss plan is easy， but continuing with the plan is difficult.

1.2.3.4.5.

跟踪导练（二）

完形填空

I can remember watching the animal documentaries on PBS when I was growing up. There was something about the wild that was 1. In spite of my love of the society of lions， nothing 2 me more than the speed and agility of an antelope （羚羊）.

In one documentary， the lions 3 their prey of choice and with every piece of artistic talent the producer had he tried to indicate that it was all over for this 4 antelope. The lions were in 5 and the first female lion made a sudden powerful movement for the 6 of the antelope. The antelope 7 in her current position and the lion must have miscalculated because she 8 her neck by centimeters. Without a 9 of hesitation （犹豫） the antelope exploded with such force and 10 that the other lions drew back and 11 trying to play catch-up.

The lions were 12 than the antelope， and they were smart. When they got close enough to the antelope， they 13 one of their paws to trip the 14 animal. Now I don't know if this antelope had one of those rear-view mirrors （后视镜） but every time a lion got close she would change direction， 15.

When pressure came from a different 16 she changed direction. When she could feel the 17 of her pursuers on her neck she changed direction. She ran until they stopped running after her. This antelope had 18. She was running for her life.

If you feel 19 and things are not going the way they should， change 20. Be the antelope. Run for your life.

1. A. confusing  B. interesting  C. disappointing  D. encouraging