完形填空，阅读下面短文，掌握其大意，然后在所给的四个选项（A、B、C和D）中选出一个最佳选项。
Is the world really going mad? ____day I was sitting in a restaurant _____ a quick drink and a talk with a few friends when it suddenly_____ me that almost everyone in the restaurant was smoking. It wasn’t long _____ the whole room was _____ with smoke. I asked with an apology for_____ to open a window to stop myself _____!
Nowadays air pollution is something that hardly question any more. However, I still can’t walk down the street in any of the big cities without _____ that people are _____ the air pollution. It is time for the government departments of the world to introduce emission(废气排放) controls on all cars and _____ the public transport system(公共交通体系) to encourage people to _____ their cars at home. A friend of mine takes flying lesson each morning and it really makes him _____ when he climbs above the smog layer(烟雾) and looks down _____ it and thinks: “I’m breathing that!” This kind of ____ results from the bad management of resources. Waste things can _____ should, be treated properly. House building, road _____, and industrial development are all earthmoving(or earth-reducing) operations and can change the balances of _____ created over millions of years. I would like to _____serious studies done on all these main works before they are built. Also, there should be _____ national parks set up to keep the most beautiful parts of our countries in their natural _____.
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