55．A．hurting　　　　　　　 B．waking　　　　　　　　 C．storing　　　　　　　　 D．hiding

20

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 　36　 you think about them in this 　37　 way. Your body is a very complicated(复杂的) machine,　 38　 a lot of chemical machinery, all of which is finally turned 　39　 it all works together . Special chemicals, which we call drugs ,can affect it in many different ways.

　 Some drugs are 　40　 when your body has a problem, as with disease-causing bacteria. Then someone may give you aspirin to keep your temperature from going too　 41　 　or some penicillin(青霉素)　 42　 it stops the growth of some kinds of bacteria.　 43　 ,all drugs are really poison,　 44　 if you take too much ,so you must always use them 　45　 　.

　 Why do some people take drugs like cocaine ? For a little while they seem to make you feel better ,or happier .But　 46　 　their effects have 　47　 ,your body has to pay an extra 　48　 to get back to normal. That makes　 you want to get 　49　 of the drug .

Drugs like cocaine have their special effects because they act as 　50　 for your nervous system. They cut off some of your nerve pathways and take away some of your senses and your　 51 　.They make you want always more . And just a little too much can even 　52　 nerves to your heart and stop its beating .

Many of us worry about the 　53　 around us and what pollution does to us .How about your internal(内在的) environment, and what goes on 　54　 you ? You control that all by yourself in what you put into your 　55　 . Most drugs are pollutants .You would not want pollutants in the air and water around you . Why would you want pollutants in your body ?

54．A．way　　　　　　　　　　 B．method　　　　　　　 C．attitude　　　　　　　 D．theory

53．A．share　　　　　　　　　 B．have　　　　　　　　　 C．discuss　　　　　　　　 D．improve

52．A．going　　　　　　　　　 B．starting　　　　　　　 C．thinking　　　　　　　 D．reviewing

51．A．surprise　　　　　　　 B．pleasure　　　　　　　 C．gift　　　　　　　　　　 D．harm

50．A．worse　　　　　　　　 B．easier　　　　　　　　　 C．more　　　　　　　　　 D．less

49．A．end　　　　　　　　　　 B．change　　　　　　　　 C．last　　　　　　　　　　 D．stop

48．A．warned　　　　　　　 B．shown　　　　　　　　 C．asked　　　　　　　　　 D．told

47．A．also　　　　　　　　　　 B．still　　　　　　　　　　 C．even　　　　　　　　　 D．already

46．A．care　　　　　　　　　　 B．see　　　　　　　　　　　 C．say　　　　　　　　　　 D．listen