We have seen that pesticides(杀虫剂)now pollute soil, water, and food, and that they have the power to make our rivers fishless and our gardens and woodlands silent and birdless. Man, however much he may like to pretend the opposite, is part of nature. Can he escape a pollution that is now so thoroughly spread throughout our world?

We know that even single exposure(暴露) to these chemicals, if the amount is large enough, can cause extremely severe poisoning. But this is not the major problem. The sudden illness or death of farmers, farm workers, and others exposed to enough quantities of pesticides is very sad and should not happen. For the population as a whole, we must pay more attention to the delayed effects of taking in small amounts of the pesticides that unseeably pollute our world.

Responsible(负责的) public health officials have pointed out that the biological effects of chemicals are increasing in amount over long periods of time, and that the danger to man may depend on the amount of the exposures received throughout his lifetime. For these very reasons people easily take no notice of the danger. It is human nature to shake off what may seem to us a future disaster(灾害). "Men are naturally most impressed by diseases which have obvious signs," says a wise physician, Dr. Rene Dubos, "yet some of their worst enemies slowly come near them unnoticed."

Which of the following is closest in meaning to the underlined sentence?

A. Man doesn't care about what happens in nature.

B. Man acts as if he does not belong to nature.

C. Man can avoid the effects of environmental pollution.

D. Man can escape his responsibilities for environmental protection.

People are likely to take no notice of the delayed effects of exposure to chemicals because________.

A. limited exposure to them does little harm to people's health

B. the present is more important to them than the future

C. the danger does not become seen clearly and immediately

D. humans are able to bear small amounts of poisoning

It can be concluded from what Dr. Dubos says that________.

A. people find hidden diseases difficult to deal with

B. attacks by hidden enemies are likely to be deadly

C. diseases with obvious signs are easy to cure

D. people are likely to take no notice of hidden dangers caused by pesticides

We have seen that pesticides(杀虫剂)now pollute soil, water, and food, and that they have the power to make our rivers fishless and our gardens and woodlands silent and birdless. Man, however much he may like to pretend the opposite, is part of nature. Can he escape a pollution that is now so thoroughly spread throughout our world?

We know that even single exposure(暴露) to these chemicals, if the amount is large enough, can cause extremely severe poisoning. But this is not the major problem. The sudden illness or death of farmers, farm workers, and others exposed to enough quantities of pesticides is very sad and should not happen. For the population as a whole, we must pay more attention to the delayed effects of taking in small amounts of the pesticides that unseeably pollute our world.

Responsible(负责的) public health officials have pointed out that the biological effects of chemicals are increasing in amount over long periods of time, and that the danger to man may depend on the amount of the exposures received throughout his lifetime. For these very reasons people easily take no notice of the danger. It is human nature to shake off what may seem to us a future disaster(灾害). "Men are naturally most impressed by diseases which have obvious signs," says a wise physician, Dr. Rene Dubos, "yet some of their worst enemies slowly come near them unnoticed."

1. Which of the following is closest in meaning to the underlined sentence?

A. Man doesn't care about what happens in nature.

B. Man acts as if he does not belong to nature.

C. Man can avoid the effects of environmental pollution.

D. Man can escape his responsibilities for environmental protection.

2. People are likely to take no notice of the delayed effects of exposure to chemicals because________.

A. limited exposure to them does little harm to people's health

B. the present is more important to them than the future

C. the danger does not become seen clearly and immediately

D. humans are able to bear small amounts of poisoning

3. It can be concluded from what Dr. Dubos says that________.

A. people find hidden diseases difficult to deal with

B. attacks by hidden enemies are likely to be deadly

C. diseases with obvious signs are easy to cure

D. people are likely to take no notice of hidden dangers caused by pesticides

【2011·山西太原市模拟一】

C

We have seen that pesticides（杀虫剂） now pollute soil, water and food, and that they have the power to make our rivers fishless and our gardens and woodlands silent and birdless．Man, however much he may like to pretend the opposite, is part of nature．Can he escape a pollution that is now so thoroughly spread throughout our world?

We know that even single exposure to these chemicals, if the amount is large enough, can cause extremely severe poisoning．But this is not the major problem．The sudden illness or death of farmers, farm workers and others exposed to enough quantities of pesticides is very sad and should not happen．For the population as a whole, we must pay more attention to the delayed effects of taking in small amounts of the pesticides that unseeably pollute our world．

Responsible public health officials have pointed out that the biological effects of chemicals are increasing in amount over long periods of time, and that the danger to the man may depend on the amount of the exposures received throughout his lifetime．For these very reasons people easily take no notice of the danger．It is human nature to shake off what may seem to us a future disaster．"Men are naturally most impressed by diseases which have obvious signs, " says a wise physician, Dr．Rene Dubos, "yet some of their worst enemies slowly come near them unnoticed．"

62．Which of the following can best summarize the first paragraph of this passage?

      A．Man has a responsibility to bear for what has happened to nature．

      B．Possibly man will escape the effects of environmental pollution．

      C．Pesticide-caused pollution may also kill people．

      D．Man acts as if he did not belong to nature．

63．People do not give enough attention to the delayed effects of exposure to chemicals because         .

      A．imited exposure to them does little harm to people's health

      B．the present is more important to them than the future

      C．humans are able to bear small amounts of poisoning

      D．the danger does not become seen clearly and immediately

64．Which of the following statements is true according to the passage?

      A．A person exposed to pesticides even once may get seriously poisoned．

      B．Birds are less sensitive to pesticides than humans．

      C．The effects of pesticides on humans do not last as long as on fish．

      D．Taking in small amounts of pesticides will not cause serious results．

65．We can conclude from what Dr Dubos says that                .

      A．people usually find hidden diseases difficult to deal with

      B．people fail to notice hidden dangers caused by pesticides

      C．diseases with obvious signs are mostly easy to cure

      D．attacks by hidden enemies are likely to be deadly

As people in Beijing and northern China struggle with severe air pollution this winter,the toxic(有毒的)air is also making life hard for plants and even food crops of China．

"in the last 50 years there has been a 1 6-fold increase in ozone(臭氧)pollution”in the Beijing area，said Hanqin Tian of Auburn University in Alabama,who studies the effects of China's pollution and climate change on plants．

Ozone is particularly harmful to plants because it damages the pores(气孔)  on leaves，called stomata,which plants use to regulate how much water evaporates from the leaves．That，in turn，affectS how much water a plant must take up through its roots．Changes in water uptake by plants have been documented in other parts of the world，including the United States，as having major impacts on regional groundwater and surface water supplies．

In studies of the long-term productivity of plants，Hanqin Tian and some of his colleagues show that ozone pollution,along with climate change，has been lowering plant productivity in China,which reduces the amount of carbon and other pollutants that the plants Can absorb to fight all the emissions from the burning offossil fuels．

The worst effects on plants are likely to be in areas where the growing pollution problem is just fairly new, said Arthur Chappelka, also a plant researcher at Auburn University．Some plants are more resistant to pollutants than others，he said，and the plants that are living today in long-polluted urban areas are likely to be only those that are very pollution tolerant．

Away from the cities, however, where crops are necded to feed China’s yast population, the effeets of the growing pollution on crops is a significant concern.

“In some ways it affects the crop production and food securiy of China,”said Hanqin Tian.“Air quality is really important for human health, plants and ecosystem and sustainability.”

The problem is bound to get worse as China continues to develop economically, he said, and so he and other researchers continue to urge the Chinese government to take action to reduce emissions from cars and industries.

1.ozone does harm to plants mainly by ________.

A.exposing them to strong sunlight

B.damaging the structure of their leaves

C.adding more pores to the roots

D.making the land unfit for the plants to grow

2.Which of the following statement does Hanqin Tian support?

A.Ozone pollution has increased 1 6 times in the past 30 years．

B．Ozone pollution has lowered plant productivity alone．

C.Plants can take in a large amount of carbon and other pollutants．

D.The toxic air has few effects on food supply in China．

3.What Can we infer from the passage?   

A．Healthy foods are not available in Beijing．

B．Some kinds of plants aren’t affected by air pollution．

C．Crops in China are hard to feed its large population．

D．People should stop developing economically

4.According to the passage，the Chinese govemment should

A．care more about developing economy

B．reduce the number of cars and industries

C．continue to make more researches

D．take measures to reduce carbon emissions

5.What′S the best title of the passage?

A．Polluted air damages plants and crops

B．Air pollution is becoming more serious

C．China’s air pollution and climate changes

D．Food security in China