第6部分：完形填空(第51～65題，每題1分，共15分)

閱讀下面的短文，文中有15處空白，每處空白給出了4個選項，請根據短文的內容從4個選項中選擇1個最佳答案，涂在答題卡相應的位置上。

Transportation

For many years in the desert, camels Used to be the only form of transportation (運輸). Before the(51) of modern trains, camel trains used to carry all the goods for trading between Central Africa and Europe. Traders sometimes (52) to put together camel trains with 10,000 to 15,000 animals. Each animal often carried (53) 400 pounds and could travel twenty miles a day. This form of transportation was so important that camels were called the "ships of the (54)."

Now modern trains travel across the desert in a very (55) time. One engine can pull as much weight as 135,000 (56). In addition, trains use special cars for their load. Refrigerator cars carry food; boxcars carry heavy goods; stock cars carry animals; and tank cars carry oil.

Air travel has changed, too. The earliest planes were biplanes (雙翼飛機), with(57) sets of wings. The top speed of this plane was 60 miles per hour. The pilots used to sit or lie on the wings in the open air. The plane(58) sometimes stopped in the middle of a trip. It used to be (59) to fly in bad weather. In snow or in rain, the wings frequently became icy. Then the plane might go down.

Mechanical improvements during the First World War changed airplanes. Monoplanes (單翼飛機) took the(60) of biplanes. Pilots flew inside of covered cabins. Still, even these planes were small and expensive. Only(61) people were be able to travel in airplanes.

Now modern jets make air travel possible for all people. No place in the world is more than 24 hours away by jet. Further improvements have (62) the cost of flying, and they have made air travel (63) safer than it used to be. A modern 707 can carry 170 people and can fly at 600 miles per hour. People(64) used to eat, sleep, or watch movies on airplanes.(65) these things are a normal part of air travel!

51 A age B series C year 　　 D period

52 A ought B added C used 　　 D led

53 A away B as many as　C out 　 D as much as

54 A desert B trains C transportation D goods

55 A quick B short C good 　　D no

56 A camels B ships C pounds 　　D cars

57 A one B three C two 　　D four

58 A wings B engines C pilots 　D speed

59 A probable B possible C improbable 　 D impossible

60 A seat B pace C place 　　D vacancy

61 A technical　B rich C those 　　D professional

62 A got rid of B raised C avoided 　　D lowered

63 A much B so C very 　　D such

64 A sometimes　B occasionally C neither 　　D never

65 A But B So C Now 　　　D However

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