公共英语考试

【单选题】 As pointed out at the beginning of the passage, people used to think that air pollution ______.
A．caused widespread damage in the countryside
B．affected the entire eastern haft of the United States
C．had damaged effect on health
D．existed merely in urban and industries areas

网考网参考答案：D
网考网解析：
解析：由第一段第一句话可知答案。 查看试题解析出处>>