The United States is well?known for its network of major highways designed to help a driver get from one place to another in the shortest possible time.? 36 ? these wide modern roads are generally ? 37 ? and well maintained, with ? 38 ? sharp curves and many straight ? 39 ?,a direct route is not always the most ? 40 ? one. Large highways often pass ? 41 ? scenic areas and interesting small towns. Furthermore, these highways generally ? 42 ? large urban centers which means that they become crowded with ? 43 ? traffic during rush hours,? 44 ? the “fast, direct” way becomes a very slow route. However, there is ? 45 ? always another route to take ? 46 ? you are not in a hurry. Not far from the ? 47 ? new “superhighways”,there are often older,? 48 ? heavily traveled roads which go through the countryside.? 49 ? of these are good two lane roads; others are uneven roads ? 50 ? through the country. These secondary routes may go up steep slopes, along hilly ? 51 ? or down frightening hillsides to towns ? 52 ? in deep valleys. Though these are less direct routes, longer and slower, they generally go to places ? 53 ? the air is clear and the scenery is beautiful, and the driver may have a ? 54 ? to get a fresh, clean ? 55 ? of the world.

36. A. Although     B. Since  C. Because      D. Therefore

37. A. rough   B. splendid     C. smooth       D. complicated

38. A. little     B. few     C. much  D. many

39. A. selections     B. separations C. divisions    D. sections

40. A. terrible B. Possible     C. enjoyable   D. reasonable

41. A. to B. Into    C. over    D. by

42. A. lead     B. connect      C. collect D. provide

43. A. large    B. fast     C. light   D. heavy

44. A. when    B. for      C. but     D. that

45. A. yet       B. still     C. almost D. quite

46. A. unless   B. if C. as       D. since

47. A. relatively     B. regularly    C. reasonably  D. respectively

48. A. and      B. Less    C. more   D. or

49. A. All       B. Several      C. Lots    D. Some

50. A. driving B. crossing     C. curving      D. traveling

51. A. rocks    B. cliffs   C. roads  D. paths

52. A. lying    B. laying C. laid     D. lied

53. A. there    B. when  C. which D. where

54. A. space    B. period C. chance       D. spot

55. A. view    B. variety       C. visit    D. Virtue

 Before a new type airplane goes service, every part of it is tested again and again. But there are two tests that are more of into important than the others.

   The first is called the “tank test”. A modern airplane must fly very high in the sky. Air must be pumped into the plane so that the passengers can breathe. The metal structure of the plane has to be very strong for this reason. When the plane is filled with air, the air presses against the skin of the plane inside. The pressure(压力)on a small window is like a huge foot that is trying to get out. If a small part of the plane were to fail, the plane would explode in the sky. To test the structure of the plane, the plane is lowered into a huge tank or container of water. Then it is filled with air. The pressure inside the plane is greater than it ever will be when it is high up in the air. Finally, there is an explosion. This does not cause so much damage inside the water tank as it would anywhere else. Engineers can discover which part of the plane has broken. Then that part is made stronger.

   The most dangerous test happens when the new plane is going through test flights in the air. The test must find out exactly what happens when the engines(发动机) are all shut off at once. The plane begins to fall like a stone. It is the pilot’s job to find out how he can get control of the plane again. These two tests are examples of how planes are made safe before they ever carry passengers.

By doing the “tank test”, the engineers can find out ____.

   A. the amount of air in the plane                B. the strength of the plane structure

   C. the pressure inside and outside the plane       D. the power of the airplane engines

What will happen to the plane under the “tank test”?

   A. It will be broken                        B. It will be made stronger.

   C. It will be filled with water.                D. It will be tested by pilots.

According to the text, why are test flights most dangerous?

   A. The plane may explode in the air          B. The pilot may lose control of the plane.

   C. The engines may be damaged.             D. Too much air may get into the plane.

What might be the most suitable title for the text?

  A. Two Important Tests on Airplane           B. The Importance of Flying Safety

  C. The Danger of Testing Airplanes            D. How Airplanes Are made and Tested

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