单选题

RESULTS OF TWO SURVEYS OF OPINIONS REGARDING THE EFFECTS OF SCIENCE OF HUMAN SOCIETY

Responses August 1991 August 1992
Mostly beneficial 25% 81%
Equally harmful 37% 9%
and beneficial    
Mostly harmful 20% 7%
No opinion 1 3%

Which of the following, if true, contributes most to explaining the shift in opinions about the effects of science on human society?

【正确答案】 A
【答案解析】