You are watching a film in which two menare having a fight. They hit one another hard. At the start they only fightwith their fists. But soon they begin hitting one another over the heads withchairs. And so it goes on until one of the men crashes (撞击) through a window and fallsthirty feet to the ground below. He is dead！Of course he isn't really dead. With any luck heisn't even hurt. Why? Because the men who fall out of high windows or jump fromfast moving trains, who crash cars or even catch fire, are professionals (专业人士). They do this for aliving. These men are called stuntmen. That is to say, they perform tricks.There are two sides to their work. They actually do most of the things you seeon the screen. For example, they fall from a high building. However, they donot fall on to hard ground but on to empty cardboard boxes covered with amattress (床垫).Again, when they hit one another with chairs, the chairs are made of soft woodand when they crash through windows, the glass is made of sugar! But althoughtheir work depends on trick of this sort, it also requires a high degree ofskill and training. Often a stuntman' s success depends on careful timing. Forexample, when he is "blown up" in a battle scene, he has to jump outof the way of the explosion just at the right moment. Naturally stuntmen are well paid for theirwork, but they lead dangerous lives. They often get seriously injured, andsometimes killed. A Norwegian stuntman, for example, skied over the edge of acliff a thousand feet high. His parachute (降落伞) failed to open, and he was killed. In spite ofall the risks, this is no longer a profession for men only. Men no longer dressup as women when actresses have to perform some dangerous action, for nowadaysthere are stunt girls too!1.Stuntmen are those who ______. A．often dress up as women B．prefer to lead dangerous lives C．often perform seemingly (表面上) dangerous actions D．often fight each other for their lives 2.Stuntmen earn their living by ______. A．playing their dirty tricks B．selling their special skills C．jumping out of high windows D．jumping from fast moving trains 3.When a stuntman falls from a highbuilding, ______. A．he needs little protection B．he will be covered with a mattress C．his life is endangered D．his safety is generally all right 4.Which of the following is the main factor(因素) of asuccessful performance? A．Strength. B．Exactness. C．Speed. D．Power. 5.What can be inferred from the author' sexample of the Norwegian stuntman? A．Sometimes an accident can occur to a stuntman. B．The percentage of serious accidents is high. C．Parachutes must be of good quality. D．The cliff is too high.