3．保护环境已成为社会的一个主要关注点。(a major concern of)

　　4．在我看来，当务之急是强化人们的环保意识。努力工作，赢得保护环境的战役是我们每个公民的职责。(as far as...concerned，it is urgent to...，citizen's duty，campaign)

　　________________________________________________________________________

　　答案：

　　With the rapid development of economy and the increasing growth of population, the negative effect on environment caused by environmental pollution through human behaviour have been got more and more serious. Now more and more people have realized that atmosphere pollution has an effect on their health and complain about it. Therefore, protecting the environment has become a major concern of the society.

　　As far as I'm concerned, it is urgent to strengthen people's awareness of environmental protection. And it's every citizen's duty to work hard to win the campaign of protecting the environment.

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