physician, Dr. Rene Dubos, "yet some of their worst enemies slowly approach them unnoticed."

1. Which of the following is closest in meaning to the sentence "Man, ...is part of nature." (Para.1)?

[A] Man appears indifferent to 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. What is the author´s attitude to wards the evnironmental effects of pesticides?

[A] Pessimistic.

[B] Indifferent.

[C] Defensive.

[D] Concerned.

3. In the author´s view, the sudden death caused by exposure to large amounts of pesticides ______.

[A] is not the worst of thenegative consequences resulting from the use of pesticides

[B] now occurs most frequently among all accidental deaths

[C] has sharply increased so as to become the center of public attention

[D] is unavoidable because people can´t do without pesticides in farming

4. People tend to ignore 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 for them than the future

[C] the danger does not become apparent immediately

[D] humans are capable of withstanding small amounts of poisoning

5. It can be concluded from Dr Dubos´ remarks that ______.

[A] people find invisible diseases difficult to deal with

[B] attacks by hidden enemies tend to be fatal

[C] diseases with obvious signs are easy to cure

[D] people tend to overlook hidden dangers caused by pesticides

答案：B D A C D