题目内容
自动控制理论的组成有（)。
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如果系统的（)模型是线性的，这种系统称为线性系统。
控制系统要能正常地工作，必须满足（)的要求。
Part IV Cloze (20 points) Directions: There are ten blanks in the following passages. And there are five choices marked A), B), C), D) and E). Match each blank with the right choice. Passage One Fire can help people in many ways. Fire can heat water, (41) () your house, give light and cook food. But fire can burn things too. Nobody knows (42) () people began to use fire. One story from Australia tells about a man a very long time ago. He went up to the sun by a rope and brought fire down. Today people know how to (43) () a fire with matches. Children sometimes like to play with them. But matches can be very dangerous. Fire kills people every year. So you must be careful about matches. You should also learn to (44) () fires. Fires need oxygen. Without oxygen they die. There is oxygen in the air. Cover a fire with water, sand, or in an emergency, with your coat or a blanket. This keeps the air (45) () a fire and kills it. Be careful with fire, and it will help you. Be careless with fire, and it might hurt you.
(1). A.make B.warm C.how D.put out E.from
(2). A.make B.warm C.how D.put out E.from
(3). A.make B.warm C.how D.put out E.from
(4). A.make B.warm C.how D.put out E.from
(5). A.make B.warm C.how D.put out E.from
American people divide their days into several blocks of time, and plan different activities (41) () different times. American time is “on the dot”(准确地)). If something is supposed to happen at Eight o’clock, it will begin at eight. Americans value promptness(准时)and may become angry if a person is more than 15 minutes late (42) () a good reason. If you know you are going to be late, call in advance and let someone know. (43) () you arrive late, you should apologize and explain why. Americans arrive (44) () time for doctors’ appointments. The doctor may keep you (45) (), but if you keep the doctor waiting, you may get a bill with the doctor’s time!
(1). A.for B.waiting C.on D.if E.without
(2). A.for B.waiting C.on D.if E.without
(3). A.for B.waiting C.on D.if E.without
(4). A.for B.waiting C.on D.if E.without
(5). A.for B.waiting C.on D.if E.without
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