阅读下面短文,将文中画线句子翻译成中文或英文。

        The world is not only hungry,but it is also thirsty for water. This may seem strange to you.

        31. As we all know,nearly 70  percent of the earth's surface is covered with water. But about 97  percent of this huge amount is sea water,or salt water. Man can only drink and use the other 3 percent. And we cannot even use all of that,because some of it is in the form of icebergs (冰川) .32. What's worse,some of the fresh water has been polluted.

Human beings should realize how serious the problem is. 33. 至少,我们得停止浪费水了。Of course,we ought to think about various ways to reuse our water. 34. 如今在大多数大城市里,水只会被用一次。

        Then it is sent out into a sewer system (下水道)From there it returns to the sea or runs into underground storage tanks. But it is possible to pipe used water to a purifying (净化) factory. There it can be treated with chemicals so that it can be used again.

        But even if every large city purified and reused its water,we still would not have enough. 35.Probably we ought to make use of the sea water on the earth. We can remove the salt to get fresh water. If we take these steps,we may be in no danger of drying up.

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   When you think of documentaries (纪录片) ,you may think they are long and boring. But documentaries can be wonderful and bring stories from the real world into our homes. With fantastic (精彩的) pictures and stories,documentaries mainly offer us much knowledge we don't know about.

   So,what should we pay attention to when we watch one?

   While watching a documentary,you should keep your eyes and ears on the themes,and listen to what the people in the documentary are saying. The themes of a documentary can go a long way in telling you its idea.

  If you’re sitting at the computer and can't think of anything to do,why not look up the ideas the documentary made? And you can make sure if they are believable (可信的) . Maybe you could leam more information.

( )1. What can we get the most from a documentary?

   A. Fantastic pictures.

   B. Funny stories.

   C. Practical skills.

   D. Much knowledge.

( )2. According to the passage,what should we care about most when we watch a documentary?

   A. Its theme. B. Its advertisement.

   C. Its pictures. D. Its ending.

( )3. According to the underlined sentence,what does the writer advise us to do?

   A. Not to watch the boring documentary.

   B. Not to believe what the documentary tells.

   C. To watch the documentary on the Internet.

   D. To further understand the documentary.

( )4. What is the best title for the passage?

   A. Documentary Programs in China

   B. Kinds of Documentary

   C. How Can We Watch a Documentary

   D. What Documentary Should We Watch

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