Israeli researchers said they had identified a naturally produced compound that may explain why only some smokers get lung cancer.
Researchers found that smokers with low levels of the enzyme were five to 10 times more likely to develop lung cancer than smokers with the highest levels.
The enzyme fixes damage done to DNA by smoking and other environmental stresses and is one of a large group of repair compounds in the body.
Writing in the Journal of the National Cancer Institute, Zvi Livneh and his colleagues said 40 per cent of the 68 lung cancer patients they tested had low levels of enzyme activity, in contrast to 4 per cent of a healthy group of 68 people.
Non-smokers with the lowest levels of enzyme also had a higher risk of lung cancer, although their overall risk of cancer was much lower than that of the smokers.
Lung cancer is by far the biggest cancer killer in the world, killing a million people every year worldwide.
Smoking is also a major cause of heart disease and stroke. The researchers said the findings needed to be confirmed in larger studies but they may lead to the development of a blood test that smokers could take to determine their personal risk. 209
1. What is Israeli researchers’ discovery?
A. A naturally produced compound
B. The possible reason for smokers to get lung cancer
C. A kind of new enzyme
D. How lung cancer developed
2. According to the author, what is the function of the enzyme?
A. Repairing any damage.
B. Damage done to DNA.
C. Causing environmental stresses.
D. Repairing compounds in the body
3. How many people have been tested on levels of enzyme activity?
A. five to 10 times more
B. 40 per cent
C. 68
D. 136
4. The test also show that non-smokers
A. had the lowest levels of enzyme
B. had a higher risk of lung cancer
C. had the risk of cancer as well
D. did not have the risk of cancer
5. Which of the following is NOT true?
A. Lung cancer is the biggest killer in the world.
B. Smoking may cause heart disease and stroke
C. The findings of Israeli researchers have to be confirmed yet.
D. Smokers could take blood test to determine their personal risk
参考答案：BDDCA
China is already the world's third largest producer of electronics, and becoming a player in the global appliance market. Twenty years ago, U.S., European and Japanese companies started moving into China to supply the local market with household goods. Now those same companies are getting whipped by Chinese competitors. Over the past six years, the market share of foreign TV makers in China has dropped from 70 percent to less than 20 percent. Matsushita opened the first microwave-oven plant in China in 1995. Two years later the Chinese company Galanz started making microwaves and selling them for half Matsushita's price.
Chinese companies now make more than 43 million TVs yearly. Konka, one of China's largest TV makers, sells its branded TVs in the United States, and has set up factories in Mexico to service the American market; While TCL, another major TV maker, exported 11 million units from its Chinese factories last year. It has more Southeast Asian factories than any other Chinese company. (164 words)
1. This passage is primarily concerned with
A. the world's third largest producer of electronics
B. Chinese electronic companies
C. China's largest TV makers
D. the increase of China's electronics
2. What do “whipped” mean?
A. beat with a whip
B. won
C. defeated
D. suffered
3. What is the decreased rate of the market share of foreign TV makers in China?
A. 70%
B. 20%
C. 50%
D. 20%--70%
4. When did Galanz start making and selling microwaves?
A. 1993
B. 1994
C. 1995
D. 1997
5. Which of the following produces more TV sets?
A. Galanz
B. Konka
C. TCL
D. Unknown
参考答案：DCCDD
