1.The air traffic controllers of an airport.
control all the planes flying near the airport.
only give orders to planes leaving the airport.
only deal with the planes that want to land there.
are allowed to handle 2,500 planes a day.
2.The danger of air crashes grows every because
airliners are getting larger and air traffic is becoming heavier.
some pilots don't always follow a controller's order.
controllers are likely to make more and more mistakes.
airpots can hardly serve the growing number of airplanes.
3.The example in the passage is to show that
air traffic controllers are often careless.
a small mistake a controller makes can lead to an accident.
it is difficult for airplanes to avoid terrible accidents.
two planes should not fly too close to each other.

1. The air traffic controllers of an airport.
control all the planes flying near the airport.
only give orders to planes leaving the airport.
only deal with the planes that want to land there.
are allowed to handle 2,500 planes a day.
1. 机场的航空交通控制员控制所有在近机场区域飞行的飞机。控制人员只发指令给从机场起飞的飞机，只处理将要在机场着陆的飞机的请求。一天可以管理2500架飞机。

2. The danger of air crashes grows every because
airliners are getting larger and air traffic is becoming heavier.
some pilots don't always follow a controller's order.
controllers are likely to make more and more mistakes.
airpots can hardly serve the growing number of airplanes.
空难的危险日渐上升，因为班机越来越大，并且航空交通越来越繁忙。一些飞行员并不能保持一直服从控制人员的命令。控制人员也更容易犯错。机场不能为数量日渐增长的飞机提供服务。

3. The example in the passage is to show that
air traffic controllers are often careless.
a small mistake a controller makes can lead to an accident.
it is difficult for airplanes to avoid terrible accidents.
two planes should not fly too close to each other.
文章中的例子表明：航空交通控制员通常粗心。控制人员的一个小错误就会引发事故。飞机很难避免可怕的事故。两架飞机不能太靠近彼此飞行。