问答题
{{I}} Listen to the following passage. Altogether the passage will be read to you four times. During the first reading, which will be read at normal speed, listen and try to understand the meaning. For the second and third readings, the passage will be read sentence by sentence, or phrase by phrase, with intervals of 15 seconds. The last reading will be read at normal speed again and during this time you should check your work. You will then be given 2 minutes to check through your work once more.
Please write the whole passage on ANSWER SHEET ONE.{{/I}}
【正确答案】
【答案解析】[听力原文]
{{B}}Airplane Engines{{/B}}
In 1945 a new type of airplane engine was invented. / It was much lighter and more powerful than earlier engines, / and enabled warplanes to fly faster and higher than ever. / This type of engine was called the jet engine / because it blows a large jet of hot air backwards at high speed. / The first airplane to use the new jet engine was built in Britain / and it began carrying passengers in 1952. / It had two jet engines and flew much higher than petrol-engine airplanes. / At this height the air is thinner and very cold, / and so the airplane can cut through the air more easily. / However, the cabin has to be air-conditioned and has to be at normal pressure / so that the passengers may eat, read and sleep in comfort. /
Today all long-distance airplanes have jet engines. / The modern jet airplanes are very big and can carry hundreds of passengers on two different floors, / which makes air travel much cheaper.