先通读下面的短文,掌握其大意,然后在每小题所给的A、B、C、D四个选项中选出一个最佳选项,将其编号填入答题卷相对应的空格内。

    The sea has always been a world of adventure(冒险)for brave people.

    In the early days of sailing, many  41  1eft home to cross wide oceans(海洋).Often these early explorers(探险家)were  42  new people to trade with. They sold things to each other.

    Today, explorers are still pushing their way  43  tons of ice in the far North. They are    44  some of the world's last unknown waters.

    Human beings have always  45  the plants and animals that live in the sea. To look at sea life up close, people have had to  46  all kinds of special equipment(设备).Nowadays face masks, air tanks and diving suits are widely  47  in underwater exploration. With them, men can dive(潜水)into deep water and be at home with the fish.

    In the early years all deep-sea divers were  48  .But now, lots of women have become divers, too. In 1970, five girls stayed for two weeks in an undersea lab.

    People cannot live under the water   49   special equipment. 'Yet people everywhere want to get to know the  50  .They want to be on it and be in it. They want to use it. They want to cross it. They want to explore it.

    Do you want to be one of these brave explorers?

41. A. students                  B. soldiers          C. sailors            D. people

42. A. looking for       B. looking up      C. looking at       D. looking forward

43. A. over                B. on                  C. in                         D. through

44. A. checking          B. exploring        C. drinking            D. planting

45. A. planted             B. brought          C. kept               D. loved

46. A. work out          B. work up         C. work at          D. work with

47. A. made               Bused                 C. seen               D. worn

48. A. boys                B. girls               C. men               D. women

49. A. in                    B. on                  C. with               D. without

50. A. river                B. lake                C. sea                D. stream

This is a street crossing. There are red and green lights at each corner. Drivers must watch the lights carefully.

When there is a green light, the cars may go. When there is a red light, the cars must stop. They must wait until the red light changes to green. Then they can go on. Sometimes the cars want to make a right turn or a left turn. They can make a right turn when the light is green or red. But they must wait until the green light is shining if they want to turn left.

Some people are color-blind(色盲). They can not tell the difference between the red and green lights. These people must not drive, or there will be accidents. We must keep our streets safe.

(   )51.Drivers must watch _____ carefully at each corner.

A.green lights                                     B.red lights

C.both green lights and red lights          D.orange lights

(   )52.When there is a red light _____ .

A. the cars may go on                         B. the cars must stop

C.the cars may make a left turn            D.the cars may take a right or left turn

(   )53.Cars can make a right turn when _____ .

A.there is a red light                            B.there is a green light

C.                           there is no light                  D. there is a red or green light

(   )54.Color-blind people may have accidents because _____ .

A.they can’t see cars                         

B.they can’t tell the difference between the red and green lights

C.they can’t see the lights

D.they can’t hear cars

(   )55.According to (根据) the passage _____ must not drive.

A.young people        B. color-blind people     C. women    D.old men

  

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