Studies also show that the visibility(能见度) in eastern regions of China has dropped by 7 to 15 km compared to that in the early 1960s，as a result of air pollution.

　　Liaoning province，the Shandong Peninsula，Wuhan in Hubei province and its surrounding area，the Changsha­Zhuzhou­Xiangtan region in Hunan province，the Chengdu­Chongqing region，and the western coast of the Taiwan Straits are also listed as areas to carry out such regional air pollution control programs，according to the plan.

　　The new plan also requires an improved air quality system，which will measure the pollution levels.“The current system，which only measures some major pollutants，cannot reflect the_true_picture.” said Chai.

　　16．It will not be enough to reduce air pollution in a single city because ________.

　　A．air pollution has been becoming more and more serious in recent years

　　B．air pollution like acid rain and smog is threatening people’s health

　　C．air pollutants in a city can travel in the sky and affect nearby areas

　　D．air pollutants stay in fixed places over the cities

　　17．Suppose the visibility in eastern regions of China was 130 km in the early 1960s，the visibility there nowadays is ________.

　　A．123 to 115 km

　　B．137 to 145 km

　　C．123 to 145 km

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