A-A+
In the 3rd paragraph the writer suggests that_
问题详情
In the 3rd paragraph the writer suggests that______.
A．people should avoid working in cities
B．Americans spend too little time outdoors
C．hazardous gases are concentrated in industrial suburbs
D．there are several ways to avoid city pollution此题为多项选择题。请帮忙给出正确答案和分析，谢谢！
参考答案
正确答案：B
解析：本题的四个选项中，只有B项为正确答案。这可从文中的“Research shows that levels of pollutants such as hazardous gases，particulate matter and other chemical ‘nasties’are usually higher indoors than out，even in the most polluted cities．”推知，即科学家研究发现室内污染实际要比室外污染更为严重，又从最后一段的“the average American spends 18 hours indoors”推知，美国人在室内待的时间过长，户外活动过少。
