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.

　　9. 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

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

　　A. 123 to 115 kmB. 137 to 145 km

　　C. 123 to 145 kmD. 115 to 137 km

　　11. The main purpose of the passage is　.

　　A. to inform readers of the damage caused by air pollution

　　B. to introduce the new plan to control air pollution

　　C. to provide official figures of air pollution levels

　　D. to point out the regions affected by air pollution

　　12. What does the underlined phrase“the true picture”in the last paragraph mean?

　　A. The major pollutants.

　　B. The key polluted areas.

　　C. The major polluted cities.

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