27. We can infer from the first two paragraphs that the industrialists disregard environmental protection chiefly because ______.
A) they are unaware of the consequences of what they are doing
B) they are reluctant to sacrifice their own economic interests
C) time has not yet come for them to put due emphasis on it
D) it is difficult for them to take effective measures
正确答案是
28. The main task now facing ecologists， environmental activists and conservationists is ______.
A) to prevent pollution by legislation， economic incentives and persuasion
B) to arouse public awareness of the importance of environmental protection
C) to take radical measures to control environmental pollution
D) to improve the quality of life by enforcing environmental standards
正确答案是
29. The word tunnel-versioned (Line 2， Para.4) most probably means ______.
A) narrow-minded
B) blind to the facts
C) short-sighted
D) able to see only one aspect
正确答案是
30. Which of the following， according to the author， should play the leading role in the solution of environmental problems?
A) Legislation and government intervention.
B) The industry‘s understanding and support.
C) The efforts of environmental health professionals.
D) The cooperation of ecologists， environmental activists and conservationists.
正确答案是