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

    We know that even single exposures 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 sufficient quantities of pesticides is very sad and should not occur. For the population as a whole, we must be more concerned with the delayed effects of absorbing small amounts of the pesticides that invisibly pollute our world.

    Responsible public health officials have pointed out that the biological effects of chemicals are cumulative over long periods of time, and that the danger to the individual may depend on the sum of the exposures received throughout his lifetime. For these very reasons the danger is easily ignored. It is human nature to shake off what may seem to us a threat of 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 approach them unnoticed.”

　　  1. Which is closest in meaning to the sentence “Man... is part of nature”?

　　　　  A. Man pretends as if he does not belong to nature.

　　　　  B. Man can't escape his responsibility for environmental protection.

　　　　  C. Man appears indifferent to what happens in nature.

　　　　  D. Man can avoid the effects of environmental pollution.

　　 2. The sudden death caused by exposure to large amounts of pesticides——.

　　　　  A. is unavailable because people can not do without pesticides in fanning.

　　　　  B. is not the worst of the negative consequences resulting from the use of pesticides.

   　　   C. now occurs most frequently among all accidental deaths.

　　　　 D. has sharply increased so as to become the center of public attention.

　　 3. People tend to ignore the delayed effects of exposure to chemicals because——

　　　　 A. the danger does not become apparent immediately

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

　　　　 C. the present is more important for them than the future

　　　　 D. humans are capable of withstanding small amounts of poisoning

　　 4. It can be inferred from Dr Dubos' remark that

　　　　 A. diseases with obvious signs are easy to cure

　　　　 B. attacks by hidden enemies tend to be fatal

　　　　 C. people tend to overlook hidden dangers caused by pesticides

　　　　 D. people find invisible diseases difficult to deal with

　　Where do pesticides (杀虫剂) fit into the picture of environmental disease? We have seen that they now pollute soil, water, and food, that they have the power to make our streams fishless and our gardens and woodlands silent and bird less. Man, however much he may like to pretend the contrary, is part of nature. Can he escape a pollution that is now so thoroughly distributed throughout our world?

    We know that even single exposures 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 sufficient quantities of pesticides is very sad and should not occur. For the population as a whole, we must be more concerned with the delayed effects of absorbing small amounts of the pesticides that invisibly pollute our world.

    Responsible public health officials have pointed out that the biological effects of chemicals are cumulative over long periods of time, and that the danger to the individual may depend on the sum of the exposures received throughout his lifetime. For these very reasons the danger is easily ignored. It is human nature to shake off what may seem to us a threat of 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 approach them unnoticed.”

　　  1. Which is closest in meaning to the sentence “Man... is part of nature”?

　　　　  A. Man pretends as if he does not belong to nature.

　　　　  B. Man can't escape his responsibility for environmental protection.

　　　　  C. Man appears indifferent to what happens in nature.

　　　　  D. Man can avoid the effects of environmental pollution.

　　 2. The sudden death caused by exposure to large amounts of pesticides——.

　　　　  A. is unavailable because people can not do without pesticides in fanning.

　　　　  B. is not the worst of the negative consequences resulting from the use of pesticides.

   　　   C. now occurs most frequently among all accidental deaths.

　　　　 D. has sharply increased so as to become the center of public attention.

　　 3. People tend to ignore the delayed effects of exposure to chemicals because——

　　　　 A. the danger does not become apparent immediately

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

　　　　 C. the present is more important for them than the future

　　　　 D. humans are capable of withstanding small amounts of poisoning

　　 4. It can be inferred from Dr Dubos' remark that

　　　　 A. diseases with obvious signs are easy to cure

　　　　 B. attacks by hidden enemies tend to be fatal

　　　　 C. people tend to overlook hidden dangers caused by pesticides

　　　　 D. people find invisible diseases difficult to deal with