Scientistsknowhowtomakeseawaterfresh.Theyknowmany 41 of...

问题详情：

Scientists know how to make sea water fresh. They know many  41  of taking out the salt. One way is to boil the salt water.  42  the water boils, the  43  rises. When the steam（蒸汽）  44  it becomes fresh water.  45  way is to use the  46  of the sun. A tray(盘)with special glass side is used. The  47  warms the sea water. The steam  48  . When the steam cools on the _49  , it is fresh water. This water runs  50  the glass into a little gutter(槽).

Still another way is to  51  the sea water. The  52  stays on the outside of the ice. Then the scientists  53  the salt. The ice is  54  water.

Do all these ways  55  ? Yes, they do.

Then why  56  we have fresh water for people who need it?

The  57  is that some day we will. But we can’t do that yet. It costs too much  58  to make salt water fresh. It costs more than most people can  59  .

But scientists are still  60  better ways. Some day, everyone may drink fresh water that comes from the salty sea.

41 .A. ideas        B. ways     C. steps          D. thoughts

42. A. Before       B. After        C. As          D. If

43. A. gas     B. air      C. steam       D. salt

44. A. appears      B. disappears   C. cools          D. warms

45. A. The other    B. Another  C. One        D. Other

46. A. heat     B. light        C. height         D. shadow

47. A. glass        B. sun      C. sky        D. tray

48. A. freezes(使…结*)    B. falls    C. disappears     D. rises

49. A. tray      B. ground  C. glass          D. way

50. A. up            B. from        C. out of         D. down

51. A. freeze        B. cool        C. pour       D. save

52. A. water         B. salt        C. sun        D. sea

53. A. wash off     B. taste       C. add            D. take off

54. A. salty        B. clear       C. fresh          D. clean

55. A. affect     B. suit           C. fit               D. work

56. A. don’t        B. needn’t    C. daren’t         D. mustn’t

57. A. problem     B. answer    C. reason       D. excuse

58. A. money         B. time         C. difficulty      D. salt

59. A. save       B. cost   C. pay         D. take

60. A. caring for     B. looking for    C. waiting for  D. depending on

【回答】

41-45 BCCCB  46-50 ABDCD 51-55 ABACD 56-60 ABACB

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