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 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?

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

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

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

39. A. as if

B even if C. where D. so that

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

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

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

43. A. besides B. thus C. however D. naturally

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