1、What might be the best title of the passage?
A.Signals of air pollution
B.Safety limits of air pollution
C.Air pollution, cancer risk
D.Air pollution, smog risk
What’s the main task of IARC?
A.To focus on cancer-causing substances.
B.To evaluate the air quality.
C.To study the developing risk of cancer.
D.To send signals to the international community.
Why should the international community take action without further delay?
A.The composition and levels of air pollution vary from place to place.
B.More and more people in developing countries are exposed to air pollution.
C.Developed countries face air pollution, the level of which is higher than the safety limits.
D.A large number of people worldwide are exposed to air pollution.
—3、C B D
阅读下列短文,从每题所给的四个选项(A、B、C和D)中,选出最佳选项。An artist in Oakland, California is using his skills to help the homeless. Greg Kloehn builds very small shelters that make life on the streets a little more comfortable. The structures offer the homeless some safety and protection from bad weather. Each little house also has wheels on the bottom so it can go wherever its owner goes.
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