Unit 5 Revealing nature

Section Ⅰ Starting out & Understanding ideas

单词拼写 根据首字母或汉语提示，用本部分所学单词的正确形式填空。

1.Through Jack’s words， I strongly s that he was lying to us.

2.You are expected to a the call with fast actions.

3.In the course of e ， some birds have lost the power of flight.

4.Mars is so d from Earth that it will take more than six months for a spaceship to arrive at it.

5.We’ve got more （种子） than we need. We can spare you some.

6.Those stone tools indicate the early cultural abilities of our human （祖先）.

7.The Employment Minister said the changes in society would （创造） new jobs.

8.They took （样本） of the patients’ blood to carry out the research.

选择填空 用方框中所给短语的适当形式填空。

in question come to exist be crowded with be similar to adapt to

1. The restaurant customers at mealtimes.

2. When they moved to France， the children the changes very well.

3. No one knows exactly when the tradition of eating dumplings .

4. The plot of this movie that of many other movies.

5. I’m only worried about Tom’s attitude to the job because his ability is not .

课文语法填空

The captain of the ship， the Beagle， wanted to find someone who would benefit from the chance of visiting distant countries. A young man 1 had left medical school without completing his degree answered the call. He received a letter 2 （predict） that he would be “ 3 disgrace to yourself and all your family”. However， the journey was full of important scientific 4 （discovery）.

The journey gave the young man the chance 5 （study） various living things in their natural environments. He noticed that some species of animals were very similar， and guessed that maybe animals evolved as they adapted 6 their changing environments. He suspected that some animals had evolved from a common ancestor. The guess was beyond traditional thoughts at that time， when people believed that all species 7 （appear） on Earth at the same time， and had not changed since. The young man brought up a 8 （complete） new idea—a theory of 9 （evolve）. He wrote a book named On the Origin of Species to explain his new theory， which immediately 10 （cause） a storm. But the young man’s scientific studies were so convincing that more and more people began to believe the theory. The young man was the famous geologist and naturalist， Charles Darwin.

1.   2.   3.   4.   5.

6.   7.   8.   9.   10.

阅读理解

Even plants can run a fever， especially when they’re under attack by insects or disease. But unlike human， plants can have their temperature taken from 3，000 feet away straight up. A decade ago， adopting the infrared （红外线） scanning technology developed for military purposes and other satellites， physicist Stephen Paley came up with a quick way to take the temperature of crops to determine which ones are under stress. The goal was to let farmers precisely target pesticide spraying rather than rain poison on a whole field， which invariably includes plants that don’t have pest problems.

Even better， Paley’s Remote Scanning Services Company could detect crop problems before they became visible to the eye. Mounted on a plane flying at 3，000 feet at night， an infrared scanner measured the heat emitted （散发） by crops. The data were transformed into a color-coded map showing where plants were running “fevers”. Farmers could then spot-spray， using 50 to 70 percent less pesticide than they otherwise would.

The bad news is that Paley’s company closed down in 1984， after only three years. Farmers resisted the new technology and long-term sponsors were hard to find. But with the renewed concern about pesticides on produce， and refinements （改进） in infrared scanning， Paley hopes to get back into operation. Agriculture experts have no doubt whether the technology works. “This technique can be used on 75 percent of agricultural land in the United States，” says George Oerther of Texas A & M. Ray Jackson， who recently retired from the Department of Agriculture.

1. Plants will emit an increased amount of heat when they are ________.

A. sprayed with pesticide B. facing an infrared scanner

C. in poor physical condition    D. under too many sun rays

2. What is the purpose of using infrared scanning in applying pesticide spraying？

A. To measure the size of the affected area. B. To estimate the damage to the crops.

C. To draw a color-coded map.      D. To locate the problem area.

3. How can farmers save a considerable amount of pesticide？

A. By making use of spot-spraying. B. By transforming poisoned rain.

C. By consulting infrared scanning experts. D. By detecting crop problems at an early stage.