空中交通如何有序运行？

    

    There are lots of traffic signs on the roads. They tell you what you can do and where you can go. However, there are no traffic signs in the sky. So how is traffic directed in the sky?

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1.What is the difference of traffic on the roads and in the sky?

A There are traffic signs on the roads, but none in the sky.

B You can go anywhere in the sky, but can’t on the roads.

C You can do what you want on the roads, but can’t in the sky.

D The traffic in the sky is not guided by a system, but by people on the roads.

解析：选A。细节理解题。根据第一段第一句话“There are lots of traffic signs on the roads.”和第三句话“However, there are no traffic signs in the sky.”可知，路上有很多交通标志，但是空中没有，故选A。

2.What’s the main idea of Paragraph 2?

A It tells what air traffic is.

B It tells how is the traffic directed in the sky.

C It tells what the safe operation of all aircraft is.

D It tells how air traffic controllers work all over the world.

解析：选B。主旨大意题。根据第一段最后一句承上启下问“So how is traffic directed in the sky?”以及第二段第一句“Airplane traffic in the air is guided by the air traffic control (ATC) system.”可知，第二段主要讲空中交通是如何被指挥的，故选B。

3.What does air controllers’ job include?

A They help pilots take off and land safely.

B They help pilots navigate carefully around bad weather.

C They organize the paths of thousands of flights.

D All of the above.

解析：选D。细节理解题。根据第三段前三句“Air traffic controllers’ job includes helping pilots take off and land safely. They help pilots navigate carefully around bad weather. Air traffic controllers also organize the paths of thousands of flights.”可知，空中交通指挥员的工作包括帮助飞行员安全起飞和降落，帮助他们在恶劣的天气中导航并组织上千驾飞机的航道，故选D。

4.Why can most flights land safely?

A Because they are very lucky.

B Because traffic flows smoothly.

C Because airplanes don’t get too close to each other.

D Because air traffic controllers made a lot of planning.

解析：选D。细节理解题。根据第三段第六句“With careful pre-flight planning and monitoring by air traffic controllers during flight, most flights land safely without any problems.”可知，有了空中交通指挥员的飞前的认真准备和飞行中的监测，大多数飞机才能不出问题安全降落，故选D。

5.What can we learn from the passage?

A Traffic is directed by no one in the sky.

B Air traffic controllers work in the air.

C Traffic controllers’ job is very important.

D Pilots don’t need any help during the good weather.

解析：选C。推理判断题。根据第二段最后一句“They oversee the safe operation of all aircraft.”以及第三段介绍空中交通指挥员的工作内容可以推断出，他们的工作对空中交通的运行起着举足轻重的作用，故选C。