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

40.---Has Tom finished his job yet?

---I have no idea of it; he _____ it this morning.

A. has been doing 　　　　　 B. had been doing　

C. did　　　 　　　　　　　　 D. was doing　

39. Animals suffered at the hands of Man ___ they were destroyed by people to make

way for agricultural land to provide food for more people.

A. in which　　　 　　　　　　　 B. for which　 　　

C. so that　　 　　　　　　　　 D. in that

38. -– Do you think we should accept that offer?

-- Yes, we should, for we ______such bad luck up till now, and time ______ out.

A. have had; is running　　　　 B. had; is running

C. have; has been run　　　　　 D. have had; has been run

37. -It shouldn’t take long to clear up after the party if we all volunteer to help.

-That’s right. _______________.

A. Many hands make light work　 B. Something is better than nothing

C. The more the merrier　　　　 D. The sooner begun, the sooner done

36. It is ______ to spend money in preventing illnesses by promoting healthy living

rather than spending it trying to make people ______ after they are ill.

A. good; good　　　 　　　　　　 B. well; better

C. better; better　　　 　　　　 D. better; good

35. ___ well prepared you are , you still need a lot of luck in mountain climbing. A. however 　　 B. whatever　　 C. no matter 　　　 　D. although