Scientists are working to stop a deadly virus that infects(感染)pigs. The virus is causing huge losses for farmers in China and other Asian countries. Many farmers have tried to contain African swine flu by quarantining(隔离)pigs and destroying infected animals. But the spread of the disease into East Asia has stepped up the search for other ways to deal with the problem.
The virus had not been considered a major concern for researchers until it appeared in China last year. Chinese farmers raise about half of the world's pigs. Some researchers think the virus might have come from infected animals in Eastern Europe or Russia. Since then, it has spread to China, Vietnam and other Asian countries. Millions of pigs have been destroyed.
Although swine flu does not sicken people, it is very infectious and deadly to pigs. "Today's situation, where you have this global danger, puts a lot more emphasis on this research,” said Doctor Luis Rodriguez. He spoke to The Associated Press. Rodriguez leads the United States government laboratory for foreign animal diseases at Plum Island , New York. As a deadly virus kills pigs across Asia, scientists are accelerating efforts to develop a vaccine (疫苗).
Vaccines often are developed by killing a virus before it is put into an animal. The disabled virus does not make the animal sick, but it activates the body's natural defenses against disease. The immune(免疫的)system is then able to identify the virus and produce antibodies against it.
However, this method is not effective with all viruses including the one that causes African swine flu. For swine flu, scientists have been working on a different kind of vaccine. It is made from a weakened virus, not a dead one. The problem for researchers has been how to change the virus so it can be safely used.
Vietnam's government reported a few weeks ago that it was testing vaccines, but provided few details of its programs. In China, the government said scientists are working on a vaccine that genetically changes the virus. That is similar to a method being used by scientists in the United States.
1.Why did the virus cause the researchers' concern when appearing in China?
A.The virus may infect people.
B.The number of pigs raised in China is huge.
C.The virus may be completely out of control.
D.Chinese science and technology is not advanced.
2.Where might the virus come from?
A.Eastern Europe or Russia. B.Vietnam.
C.African countries. D.America.
3.What is the function of the disabled virus according to Rodriguez?
A.It makes people fall ill.
B.It destroys the immune system of animals.
C.It helps the body produce antibodies against disease.
D.It makes the body's natural defense against disease work.
4.What is the best title for the text?
A.The Emphasis of the Virus Research
B.Swine Flu Leads to the Deaths of Lots of Pigs
C.Scientists Hurry to Develop Vaccine for Swine Flu
D.New Results About Government Laboratory for Animal Diseases
高二英语阅读理解中等难度题
Scientists are working to stop a deadly virus that infects(感染)pigs. The virus is causing huge losses for farmers in China and other Asian countries. Many farmers have tried to contain African swine flu by quarantining(隔离)pigs and destroying infected animals. But the spread of the disease into East Asia has stepped up the search for other ways to deal with the problem.
The virus had not been considered a major concern for researchers until it appeared in China last year. Chinese farmers raise about half of the world's pigs. Some researchers think the virus might have come from infected animals in Eastern Europe or Russia. Since then, it has spread to China, Vietnam and other Asian countries. Millions of pigs have been destroyed.
Although swine flu does not sicken people, it is very infectious and deadly to pigs. "Today's situation, where you have this global danger, puts a lot more emphasis on this research,” said Doctor Luis Rodriguez. He spoke to The Associated Press. Rodriguez leads the United States government laboratory for foreign animal diseases at Plum Island , New York. As a deadly virus kills pigs across Asia, scientists are accelerating efforts to develop a vaccine (疫苗).
Vaccines often are developed by killing a virus before it is put into an animal. The disabled virus does not make the animal sick, but it activates the body's natural defenses against disease. The immune(免疫的)system is then able to identify the virus and produce antibodies against it.
However, this method is not effective with all viruses including the one that causes African swine flu. For swine flu, scientists have been working on a different kind of vaccine. It is made from a weakened virus, not a dead one. The problem for researchers has been how to change the virus so it can be safely used.
Vietnam's government reported a few weeks ago that it was testing vaccines, but provided few details of its programs. In China, the government said scientists are working on a vaccine that genetically changes the virus. That is similar to a method being used by scientists in the United States.
1.Why did the virus cause the researchers' concern when appearing in China?
A.The virus may infect people.
B.The number of pigs raised in China is huge.
C.The virus may be completely out of control.
D.Chinese science and technology is not advanced.
2.Where might the virus come from?
A.Eastern Europe or Russia. B.Vietnam.
C.African countries. D.America.
3.What is the function of the disabled virus according to Rodriguez?
A.It makes people fall ill.
B.It destroys the immune system of animals.
C.It helps the body produce antibodies against disease.
D.It makes the body's natural defense against disease work.
4.What is the best title for the text?
A.The Emphasis of the Virus Research
B.Swine Flu Leads to the Deaths of Lots of Pigs
C.Scientists Hurry to Develop Vaccine for Swine Flu
D.New Results About Government Laboratory for Animal Diseases
高二英语阅读理解中等难度题查看答案及解析
A team of American scientists has found a treatment to protect humans from the deadly H5N1 flu virus, ________ brings great ________ to the world.
A. that; appearance B. which; relief C. which; advantage D. that; profit
高二英语单项填空简单题查看答案及解析
Here's a new warning from health experts：sitting is deadly. Scientists are increasingly warning that sitting for long periods, even if you exercise regularly, could be bad for your health. And it doesn't matter where the sitting takes place—in the office, at school, in the car or before a computer or TV. Just the overall number of hours it takes counts. Several studies suggest people who spend most of their days sitting are more likely to be fat, have a heart attack or even die.
While health officials have issued (发布) guidelines advising on the least amounts of physical activity, they haven't suggested people try to limit how much time they spend in a seated position.
“After four hours of sitting, the body starts to send harmful signals，” said EkblomBak of the Swedish School of Sport and Health Sciences. She explained that genes controlling the amount of glucose (葡萄糖) and fat in the body start to shut down.
Even for people who exercise, spending long periods of time sitting at a desk is still harmful. Tim Armstrong, a physical activity expert at the World Health Organization, said people who exercise every day but still spend a lot of time sitting might get more benefits if that exercise were spread across the day, rather than in a single hour.
Still in a study that tracked more than 17,000 Canadians for about a dozen years, researchers found people who sat more had a higher death risk, whether they exercised or not.
Experts said more research is needed to figure out just how much sitting is dangerous, and what might be possible to offset those effects.
“People should keep exercising because that has a lot of benefits，” EkblomBak said. “And when they're in the office, they should try to interrupt sitting as often as possible. ”
1.The underlined word “offset” in Paragraph 6 most probably means “________”．
A. turn to B. work out
C. get rid of D. make use of
2.Sitting too much is dangerous because it can ______.
A. make a person unable to exercise enough in a day
B. destroy the balance of glucose and fat the body
C. increase glucose and fat in the body
D. make a person become lazy
3.In the opinion of EkblomBak, when at work, you'd better have a rest by ________.
A. sending your friends emails
B. taking a walk around your office
C. chatting online or playing computer games
D. listening to music while sitting
4.Which of the following might be the best title for the passage?
A. Side Effects of Sitting Too Much
B. Don't Sit Too Much While Working
C. More and More People Sit Too Much
D. Sitting Too Much Could Be Dangerous
高二英语阅读理解中等难度题查看答案及解析
The doctor said jokingly that his own infection of the virus _______ the discovery of a vaccine ()of the disease.
A. stood for B. called for C. paid for D. contributed to
高二英语单项填空简单题查看答案及解析
Last night the order came that all those infected with the deadly disease ________.
A. was separated B. should separate C. be separated D. were separated
高二英语单项填空简单题查看答案及解析
—How did she get infected?
—She ____ the viruses without any protection.
| A．exposed to | B．had exposed to | C．was exposed to | D．has exposed to |
高二英语单项填空中等难度题查看答案及解析
--How did he get infected?
--She ____the viruses without any protection.
| A．exposed to | B．had exposed to | C．was exposed to | D．had been exposed |
高二英语单项填空中等难度题查看答案及解析
Scientists find that hard-working people live longer than average men and women. Career women are healthier than housewives. Evidence shows that the jobless are in poorer health than the job-holders. A study shows that whenever the employment rate increases by 1%, the death rate decreases correspondingly(相应地) by 2%. All this comes down to one point: work is helpful to health.
Why is work good for health? It is because work keeps people busy, away from loneliness. Researches show that people feel unhappy, worried and lonely when they have nothing to do. Instead, the happiest are those who are busy. Work serves as a bridge between man and reality. By work, people come into contact with each other. By collective activities, they find friendship and warmth. This is helpful to health. The loss of work means the loss of everything. It affects man spiritually and makes him likely to disease.
Besides, work gives one a sense of fulfillment and a sense of achievement. Work makes one feel his value and status in society. When a writer finishes his writing or a teacher sees his students grow, they are happy beyond words.
[写作内容]
1.以约30个词概括短文的要点；
2.然后以约120个词就“努力学习，快乐生活”的主题发表看法，并包括如下要点：
(1)你赞同“努力学习也可以快乐生活”这一观点吗？简要阐述理由。
(2)举例说明你的同学是如何努力学习并保持健康乐观的心态的？
(3)简述如何才能做到努力学习并快乐生活？
[写作要求]
在作文中可以使用自己亲身的经历或虚构的故事，也可以参照阅读材料的内容但不得直接引用原文中
的句子；
2. 作文中不能出现真实姓名和学校名称。
[评分标准] 概括准确，语言规范，内容合适，篇章连贯。
高二英语书面表达中等难度题查看答案及解析
Scientists find that hard-working people live longer than average men and women．Career women are _ _ than housewives．Evidence shows that _ _are in poorer health than the job-holders．A study shows that _ _the unemployment rate increases by 1%，the death rate increases correspondingly by 2%．All this comes down to one point：Work is helpful to health．
Why is work good for health? It is because work _ _ people busy, _ _ loneliness and solitude. Researches show that people feel unhappy，_ _and lonely when they have nothing to do．Instead，the happiest are those who are _ _ ．Many high achievers who love their careers feel that they are happiest when they are working hard . Work serves as _ _ between man and reality．By work，people_ _ each other．By collective activity，they find friendship and warmth．This is helpful to health．The loss of work _ _ the loss of everything．It affects man spiritually and _ _ him liable to disease．
_ _ ，work gives one a sense of fulfillment and a sense of _ _ ．Work makes one feel his value and status in society．When _ _ finishes his writing or a doctor successfully _ _a patient or a teacher sees his students _ _，they are happy _ _ ．
From the above we can _ _ to the conclusion that the more you work, _ _and healthier you will be．Let us work hard，study well and _ _ a happy and healthy life．
1.A．richer B．healthier C．weaker D．worse
2.A．the old B．the busy C．the jobless D．the hard-working
3.A．whenever B．whether C．though D．since
4.A．keeps B．forces C．needs D．require
5.A．in charge of B．in lack of C．in touch with D. away from
6.A．interested B．joyful C．concerned D．worried
7.A．busy B．free C．lazy D．dull
8.A．a guard B．a gap C．a channel D．a bridge
9.A．come across B．come into contact with C．look down upon D．watch over
10.A．means B．stands C．helps D．matches
11.A．forces B．orders C．finds D．makes
12.A．Besides B．Then C．However D．Yet
13.A．disappointment B．achievement C．regret D．apology
14.A．a worker B．a farmer C．a writer D．a manager
15.A．makes friends with B．has a talk C．operates on D．deals with
16.A．raise B．grow C．rise D．increase
17.A．in a word B．without a word C．at a word D．beyond words
18.A．come B．reach C．arrive D．draw
19.A．the lonelier B．the weaker C．the stronger D．the happier
20.A．lead B．make C．earn D．share
高二英语完形填空中等难度题查看答案及解析
Scientists find that hard-working people live longer than average men and women. Career women are__1___ than housewives．Evidence shows that __2_ are in poorer health than the job-holders．A study shows that _3___ the unemployment rate increases by 1%，the death rate in-creases correspondingly by 2%．All this comes down to one point：Work is helpful to health．
Why is work good for health? It is because work ___4_people busy, _5__ loneliness and solitude . Researches show that people feel unhappy，_6__ and lonely when they have nothing to do．Instead，the happiest are those who are _7___．Many high achievers who love their careers feel that they are happiest when they are working hard . Work serves as __8___ between man and reality．By work，people_9__ each other．By collective activity，they find friendship and warmth．This is helpful to health．The loss of work __10__ the loss of everything．It affects man spiritually and __11_ him liable to disease．
__12__ ，work gives one a sense of fulfillment and a sense of _13__ ．Work makes one feel his value and status in society．When __14__finishes his writing or a doctor successfully __15__ a patient or a teacher sees his students __16_ ，they are happy ___17__．
From the above we can _18__ to the conclusion that the more you work, _19___ and healthier you will be．Let us work hard，study well and __20__ a happy and healthy life．
1. A．richer B．weaker C．healthier D．wors
2. A．the old B．the busy C．the hard-working D．the jobless
3. A．whether B．whenever C．though D．since
4. A．forces B．keeps C．needs D．require
5. A．away from B．in lack of C．in touch with D．in charge of
6. A．worried B．joyful C．concerned D．interested
7. A．free B．busy C．lazy D．dull
8. A．a bridge B．a gap C．a channel D．a guard
9. A．come across B．look down upon C．come into contact with D．watch over
10. A．stands B．means C．helps D．matches
11. A．makes B．orders C．finds D．forces
12. A．Then B．Besides C．However D．Yet
13. A．disappointment B．regret C．achievement D．apology
14. A．a worker B．a farmer C．a manager D．a writer
15. A．makes friends with B．has a talk C．deals with D．operates on
16. A．raise B．rise C．grow D．increase
17. A．beyond words B．without a word C．at a word D．in a word
18. A．reach B．come C．arrive D．draw
19. A．the happier B．the weaker C．the stronger D．the lonelier
20. A．make B．lead C．earn D．share
高二英语完型填空中等难度题查看答案及解析