On cold days in Delhi, the poor light bonfires (篝火) of tyres, trees and rags whose fumes mix with the exhaust from the city’s 2 million vehicles to form a thick smog. On most days in Mexico City, a blanket of pollution cuts off views of the surrounding mountains. On one famous occasion it got so bad that birds fell dead out of the sky on to the Zocalo, the city’s main square. Throughout the developing world, smogs in many big cities are getting worse as more people use cars and more manufacturing firms are belching out (喷出) pollution. Congestion is on the rise. too: according to one estimate, a car in Bangkok now spends the equivalent of 40 days a year stuck in traffic. The air in Asia’s cities, like the water in its rivers, is particularly unhealthy, containing levels of dust and smoke several times higher than in the rich countries’ cities.
Environmentalists in the developed world also worry about air pollution in poorer countries. not just out o
A. describing several world famous cities in developing countries
B. illustrating the seriousness of environmental problems in developing countries
C. drawing a picture about the seriously polluted future world
D. comparing the pollution problems in developed and developing countries
There (1) not one type of reading but several according to your reasons for reading. To read carefully, you have to (2) your reading speed and technique (3) your aim (4) reading. Skimming is a technique necessary for quick and efficient reading.
When skimming, you (5) the reading (6) quickly in order to get the (7) of it, to know how it is organized, (8) an idea of the tone or the intention of the writer. Skimming is (9) an activity which (10) an overall view of the text and (11) a definite reading competence.
Skimming doesn’t need reading all the material, but it doesn’t mean that it is an (12) skill for the lazy, because it need a high degree of alertness and concentration.
When you read, you usually start with (13) understanding and move towards detailed understanding rather than working the other way round. But (14) is also used after you have
A. run through
B. run over
C. go on
D. go through
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