题干

环境保护
怒江是我国尚待开发的大型水电能源基地之一,尚未开发的水能资源大多位于生态环境敏感区,下图中为规划中的梯级电站示意图,目前怒江水电开发计划备受争议。

分析怒江水电开发建设对流域环境带来的不利影响。
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答案(点此获取答案解析)

工程建设占用土地,砍伐和毁坏森林,植被破坏严重,使得流域生态环境恶化;改变水生生物的生长环境,阻断陆生生物的迁徙和交流;电站工程的修建过程加剧水土流失,增加河道的淤积;库区淹没和工程占用的耕地临时或永久地丧失耕种功能,库区水位的变化影响当地的农业灌溉系统;影响自然生态景观和库区内自然保护区的保护对象。

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    A year ago, I paid no attention to English idioms( 习语 ), though my teacher emphasized(强调) the importance again and again. But soon, the importance of English idioms was shown in an amusing experience.

    One day, I happened to meet an Englishman on the road, and soon we began to talk. As I was talking about how I was studying English, the foreigner seemed to be astonished. Gently shaking his head, shrugging his shoulders, he said, “You don't say!” “You don't say!” I was puzzled. I thought, perhaps this is not an appropriate(合适的) topic. “Well, I'd better change the topic.” So I said to him. “Well, shall we talk about the Great Wall? By the way, have you ever been there?” “Certainly, everyone back home will laugh at me if I leave China without seeing it. It was magnificent(宏伟的).” He was deep in thought when I began to talk like a tourist guide. “The Great Wall is one of the wonders in the world. We are very proud of it.” Soon I was interrupted again by his words “You don't say!” I couldn't help asking, “Why do you ask me not to talk about it?” “Well, I didn't request you to do so,” he answered, greatly surprised. I said, “Didn't you say ‘you don't say?'” Hearing this, the Englishman laughed to tears. He began to explain, “‘You don't say' actually means ‘really!'. It is an expression of surprise. Perhaps you don't pay attention to English idioms.” Only then did I know I had made a fool of myself. Since then I have been more careful with idiomatic expressions(习语表达). Remember -- what the English teachers said is always right to us students.