16. Athletes from all over the world ____ the Olympic Games every four years.   A. participate      B. attend         C. join          D. take part 17. He takes his _____ home every Friday.   A. salary         B. income        C. wage         D. pay 18. Children and old people don’t like breaking their daily ____.   A. habit          B. routine        C. practice        D. custom 19.He is not a millionaire but he _____ he were.   A. wishes        B believes        C. expects        D. thinks 20. If you want to _____ successfully with people from other cultures when you are in _____ with them, you should understand what you can and cannot do. A. interact; contact    B. interact; contacted   C. contact; interact    D. contact; contract

二完形填空(共20小题,每小题1分,满分20分)

  What is in the drug that makes you sick or dead ? For example ,cocaine is harmful ,but what makes it harmful?

  I can’t tell you all about drugs ,but I can  21  you think about them in this  22  way. Your body is a very complicated(复杂的)machine,  23 a lot of chemical machinery, all of which is finally turned  24  it all works together . Special chemicals, which we call drugs ,can affect it in many different ways.

  Some drugs are  25  when your body has a problem, as with disease-causing bacteria. Then someone may give you aspirin to keep your temperature from going too  26   or some penicillin(青霉素)  27  it stops the growth of some kinds of bacteria.  28  ,all drugs are really poison,  29 if you take too much ,so you must always use them  30  .

  Why do some people take drugs like cocaine ? For a little while they seem to make you feel better ,or happier .But  31   their effects have  32  ,your body has to pay an extra  33  to get back to normal. That makes you want to get  34  of the drug .

Drugs like cocaine have their special effects because they act as  35  for your nervous system. They cut off some of your nerve pathways and take away some of your senses and your  36  .They make you want always more . And just a little too much can even  37  nerves to your heart and stop its beating .

Many of us worry about the  38 around us and what pollution does to us .How about your internal(内在的) environment, and what goes on  39  you ? You control that all by yourself in what you put into your  40  . Most drugs are pollutants .You would not want pollutants in the air and water around you . Why would you want pollutants in your body ?

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