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  41 you think about them in this  42  way. Your body is a very complicated(复杂的) machine,  43  a lot of chemical machinery, all of which is finally turned  44  it all works together . Special chemicals, which we call drugs ,can affect it in many different ways.

  Some drugs are  45  when your body has a problem, as with disease-causing bacteria. Then someone may give you aspirin to keep your temperature from going too  46   or some penicillin(青霉素)  47  it stops the growth of some kinds of bacteria.  48  , all drugs are really poison,  49  if you take too much ,so you must always use them  50  .

  Why do some people take drugs like cocaine ? For a little while they seem to make you feel better , or happier .But  51   their effects have  52  ,your body has to pay an extra  53  to get back to normal. That makes  you want to get  54  of the drug .

Drugs like cocaine have their special effects because they act as  55  for your nervous system. They cut off some of your nerve pathways and take away some of your senses and your  56  . They make you want always more . And just a little too much can even  57  nerves to your heart and stop its beating .

Many of us worry about the  58  around us and what pollution does to us .How about your internal(内在的) environment, and what goes on  59  you ? You control that all by yourself in what you put into your  60 . Most drugs are pollutants.You would not want pollutants in the air and water around you.Why would you want pollutants in your body ?

41.A.make     B.cause     C.help       D.let

42.A.funny     B.different   C.simple       D.true

43.A.just     B.really    C.especially      D.sometimes

44.A.as if     B.even if    C.where       D.so that

45.A.powerful   B.helpful    C.painful       D.helpless

46.A.high     B.tall     C.much       D.hot

47.A.when     B.until     C. as         D.before

48.A.Besides    B.Thus     C.However       D.Naturally

49.A.at most    B.at least   C.at times     D.at first

50.A.carefully   B.easily    C.carelessly    D.a lot

51.A.where     B.before    C.after        D.until

52.A.worked    B.worn     C.appeared     D.lost

53.A.number    B.quantity   C.amount       D.price

54.A.some more   B.nothing    C.a little     D.a few

55.A.guards    B.medicine   C.chemicals      D.poisons

56.A.worries    B.happiness   C.freedom       D.pride

57.A.lead     B.block     C.offer        D.stick

58.A.places    B.nature    C.people        D.environment

59.A.inside    B.around    C.outside      D.next to

60.A.heart     B.head     C.body       D.mind

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