But no matter how well the equipment works, operators of the equipment still play an important role. Communications between pilots and ground controllers are extremely important to air safety. It is worth pointing out that the mishearing or misunderstanding of instructions in English, and the use of another language, in an international conversation, have led to two recent aircraft accidents. A new type of instrument (仪器) called FLIGHTWATCH would help pilots prevent airport collisions. It would be particularly helpful near airports.

　　1. The

　　increasing

　　number

　　of flights leads to the fact that________.

　　A. flying is no longer limited in the sky

　　B. there is no empty space for aids to aviation control

　　C. piloting and controlling planes is getting more difficult

　　D. the pressure on the ground becomes greater

　　答案: on pilots and ground controllers"意思是世界航空研究者们担心飞行员和地面导航的日益增长的压力，正好与C项吻合。

　　2. There is uncertainty about air safety because

　　.

　　A. planes become bigger for the increasing number of passengers

　　B. money spent on electronic equipment is far from enough

　　B. suitable electronic equipment hasn't been invented yet

　　D. it is dangerous for planes to take off or land

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