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D 飞行小常识 说明文 图1 ☆☆☆☆☆ 9分钟
Flying is a fast way to travel. But it is a big headache for some people. They can't help worrying about things like "Is turbulence(紊流) a bad thing?" or "Is it dangerous if we don't change our mobile phones to flight mode?" Some experts can answer these questions. They also tell us other interesting things about flying.
Is turbulence dangerous?
It's scary and uncomfortable. But it is not something you really need to worry about. Turbulence is caused when two groups of air hit one another at different speeds. Wind, thunderstorms(雷雨) and being close to mountains can be reasons for this. You may feel like turbulence is dangerous, but it won't crash(撞毁) your plane.

Why are plane windows round?
Round windows are for passengers' safety. As the airplane flies higher and higher, the outside atmospheric pressure(大气压) gets lower and lower. During the flight, the pressure inside the plane becomes greater than the pressure outside. When this happens, square windows can break. That's because having different pressures inside and outside puts stress on the corners of square windows. But round corners can spread the pressure through the window.
What happens when a phone isn't on flight mode?
Some passengers believe mobile phones need to be turned off because they could bring the plane down. However, this is not true. If you don't change your phone to flight mode, pilots and air traffic controllers may hear unpleasant sounds in their headphones. It also influences radio communications. So it's still best to change your mobile phones to flight mode.
()1. According to Paragraph 1, we learn that the passage is going to .
A. show what worries people may have about flying
B. interview some experts about flying
C. give people tips about how to travel by plane
D. explain some interesting facts about flying
()2. What will happen when there is turbulence?
A. People may feel uncomfortable.
B. Two planes may hit each other easily.
C. It will make the plane drop suddenly.
D. It can break off the plane wings.
()3. Planes use round windows rather than square ones, because .
A. round windows can spread the pressure
B. round windows can add outside stress
C. square windows can lower the pressure on the windows
D. the corners of square windows are difficult to make
()4. What will happen if a phone ISN'T on flight mode?
A. The plane will crash.
B. Air traffic controllers can't get any information.
C. It may influence radio communications.
D. It may be noisy in the plane.

D
【短文大意】本文简要介绍了几则关于飞行的小常识。首先告知读者飞行过程中遇到的紊流并不危险,其次解释了飞机的窗户为什么是圆形的,最后说明在飞行过程中将手机调成飞行模式的重要性。
1. D 【解析】推理判断题。根据第一段最后一句“They also tell us other interesting things about flying.”可知,本句起到承上启下的作用,引出下文。
2. A 【解析】细节理解题。根据“Is turbulence dangerous?”部分的第一句“It's scary and uncomfortable.”可知,在飞行过程中遇到紊流时,人们会感到不适。
3. A 【解析】细节理解题。根据“Why are plane windows round?”部分中的最后一句“But round corners can spread the pressure through the window.”可知,圆形窗户能疏散压力。
4. C 【解析】细节理解题。根据最后一段倒数第二句“It also influences radio communications.”可知,开着的手机如果没调至飞行模式会干扰无线电信号。