terest.every day a lot of tourists come here to enjoy its beauty. but a few years ago,some of them paid no attention to protecting the environment.they threw their rubbish,such as plastic bags,fruit skins and waste paper on the ground.sometimes they broke trees,picked flowers and killed birds. some even made fires in the woods to cook food.how dangerous it was.luckily,great changes have taken place here.tourists are used to putting their rubbish into dustbins,and they are doing their best to protect the birds and plants as well.they bring their own meals instead of cooking to prevent starting a forest fire in the mountains.all these changes make us very happy.

　　b. [思路点拨]：

　　①夹叙夹议(说明现状，谈谈感想)。

　　②时态：一般现在时态。

　　③广告词的含义——水很重要，应保护和再利用(写作意图)。

　　water is very important to humans.we can’t live without water.the water we can drink is falling.but some people don’t seem to care about it.they waste a lot of water.they p

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