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【答案】

The most serious environmental problem

—global warming

There are many big environmental problems facing us on the earth today, but I think the most serious one is global warming. Global warming means an average increase in the earth’s temperature. It is caused by gases from cars, waste gases from factories, destruction of forests, and so on. Global warming will cause changes in climate. A warmer earth may lead to more rain and the rising of the sea level. In this case, some land will be flooded and also it will have a bad influence on both human beings and wildlife.

So, how to solve the problem of global warming is really urgent for human beings. What can we do? First of all, people should be educated to raise the awareness of environmental protection. Also, we should call for people to take action and encourage people to use bicycles instead of cars and clean poisonous gases before they come out of factories. Besides, we should plant more trees. If we try our best to take better care of the earth, we will make our world a better place.

【解析】

试题分析：本文是一篇提纲类作文，要求根据所给的提示内容写一篇文章。根据提示的信息可知，内容包括：污染的原因，后果等几个方面。本文是一则通知，所以用第一人称，以一般现在时为主。写作时要充分发挥想象，适当的添加自己的观点，使文章内容丰满，并达到要求的字数。此外为了提高文章档次，还要注意使用多种句式和高级词汇，并添加关联词让行文流畅。

【亮点说明】本篇书面表达使用了两段式结构，开门见山地点明了环境问题和全球变暖问题；第二段说明了我们应该采取的措施然后发出号召。本文的亮点是运用了恰当的关联词，如besides等让文章衔接自然；句式try one's best、Also...和定语从句等结构的运用也为文章增添了亮色。