1. (2018七上·温州期末) 阅读下面的文本，从A、B、C、D四个选项中选出最佳选项。

C

    The life of a computer is usually about five years．After that．it may become slow or even stop working．Here are some tips on how to make your computer work longer．

    Keep it clean．Dust makes your computer slow．Remember to sweep the dust in your computer from time to time．Clean your screen with screen cleaner,never window cleaner．Also，don't eat food or place drinks next to your computer．

      ▲    ． When your computer is working,the CPU can get so hot that you can even cook on it.Try to put your computer in a clean room that stays cool and out of the sun．And don't put anything in front of the fans of your computer．

    Keep it new．Sometimes，the computer needs updating．It takes time but can make your computer work fast and well．And too many old and useless documents are bad for your computer．You need to clean them up often(at least once a month)．

    Don't move it．When the computer is running，it's not a good idea to move it．Keep it still because too much movement can stop your computer from working．

    Don't turn it on and off too often．Turning it off one time every day(like at night)is fine．But too many times of that can make it difficult for your computer to work．

    Take good care of your computer，and it can be with you much longer．

1. （1） How many tips are there in the passage(文章)?  

   A . Four． B . Five． C . Six． D . Seven．
3. （2） Which can be the heading(小标题)of the 3^rd paragraph(段落)?  

   A . Keep it hot． B . Keep it cool． C . Keep it slow． D . Keep it long．
5. （3） The underlined word "still" in the 5^th paragraph means    ．  

   A . working B . running C . not moving D . not using
7. （4） The life of our computer may be longer when we    ．  

   A . turn it off every time after we use it B . put it under the sun before we use it C . see it as something important and use it with care D . find many documents about study and save them all