59、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.

　　—60、CB

　　61、D

　　C5 [2017·广东卷] ----D

　　While Jennifer was at home taking an online exam for her business law class, a monitor(监控器)a few hundred miles away was watching her every move.

　　Using a web camera equipped in Jennifer's Los Angeles apartment, the monitor in Phoenix tracked how frequently her eyes moved from the computer screen and listened for the secret sounds of a possible helper in the room. Her Internet access was locked—remotely—to prevent Internet searches, and her typing style was analyzed to make sure she was who she said she was: Did she enter her student number at the same speed as she had in the past? Or was she slowing down?

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