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

　　【2016模拟题】 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。

　　When I was 8 years old, I decided to run away from home after a quarrel with my mother. With my suitcase packed and some sandwiches in a bag, I started for the front door.

　　My mom asked where I was going. “I’m leaving home,” I said.

　　“What’s that you’re carrying?” she asked.

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