单项选择题

In common with many countries, Britain has serious environmental problems. In 1952, more than 4,000 people died in London because of the smog. The government 21 new laws to stop smog from coal fires and factories and the 22 improved a lot.
Today, London is much cleaner 23 there is a new problem: smog from ears. In December 1991, there was very 24 wind in London and pollution 25 a lot, which led to 160 deaths in just four days.
26 of the problem is the new "out of town" shopping centers. In the past, people often 27 to shops near their homes or went by bus. Today, many people drive to the new shopping centers. 28 , the small shops have 29 and more people have to go a long way to 30 their shopping.
Critics say that Britain needs better and cheaper public 31 . Many people are trying to 32 the use of ears in Britain. Some cities now have special bicycle 33 and many people ride to work. Some people also 34 to work together in one ear to reduce the pollution and the 35 .
Sometimes people take "direct 36 ". In 1995, for example, many people wanted to 37 a new road near Newbury. They built houses 38 trees and lived there for many months. It 39 a long time to force the people out of the trees 40 work on the road could continue.

A.Meanwhile
B.As a result
C.Nevertheless
D.Besides
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