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Flying Objects It is sometimes reported that strange objects have been seen high up in the air. These Unidentified Flying Objects (UFOs) have caused a lot of interest. Some of the reports about them are difficult to believe. Some have been explained in scientific ways. Others have never been explained. It is not easy to decide whether a report is true or not. One report of an unidentified object came from a British aeroplane on its way from New York to London in 1954. The British machine was flying over an island at 19,000 feet when the captain and others on board noticed something on the left and rather lower than their aeroplane. It was about five miles away. 'It became clear,' the captain said, 'that it was not one object but several. We saw one large object and six smaller objects. I sent out a radio report about it, and I received the answer that fighter planes were coming out to meet us. Before the fighters were in sight, the smaller objects entered the big object. The big object then became smaller and moved away fast—unbelievably fast.' The captain later answered a lot of questions from newspapermen. 'How long did you have for studying the objects, Captain Howard?' 'They stayed with us for about six minutes.' 'What shape were the objects?'. 'The large one was continually changing its shape, but each of tile smaller ones was round like a ball.' 'What do you mean by 'changing its shape', Captain?' 'Well—at one time the big one had the shape of a telephone receiver, but sometimes it was round When it flew away it seemed to be rather like a very big plate in shape.' 'Tell us, Captain Howard—err—were you afraid?' 'I truthfully say that I wasn't. None of the people in the plane felt any fear. We talked about that, and we all agreed that in fact we felt friendly towards the objects.' There are other accounts of flying objects which have been seen from the air or from the ground. And many of those who have told us about them are men like Captain Howard—men of sense and experience, men whose word can be trusted. Dennis Bardens, who wrote the book Mysterious Worlds, tells us that he once saw a UFO himself. He had dinner one night with a friend near Tripoli, Libya, and after dinner the two men walked across to his room to look at some papers. Bardens noticed a light high up over the sea. It was a red light. He turned to his friend, and mentioned that the moon looked strange that night. 'It isn't the moon,' was the reply. They watched the light and saw that it was moving. It seemed to be an object rather like a big plate. In some ways it looked like smoke with a light on it but it was not smoke because it did not change its shape. It was moving in a regular way. That is to say, it did not go suddenly faster or more slowly, and it did not go higher or lower. So the two men decided that there must be men in it. When it came nearer to Libya, Bardens says that he felt eyes looking at him. He was being watched in the darkness. When it was nearer, they noticed that the bottom parts were brighter than the top. The bottom was yellow and the top red. Then the object suddenly turned away and left Libya, moving very fast. On a later day Bardens talked to other people about it, and he found some who had seen it. They all described it in the same way. Could they all be mistaken? Other people in different parts of the world believe that they have seen UFOs. Those who used to laugh at the idea do not laugh so often now. A lot of reports and books have been written on this subject, and it seems impossible to take no notice of them. Few people really believe it's UFOs, but perhaps they will in the future. Let us consider another of the reports. Let us
A.
Y
B.
N
C.
NG
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A.
块高内聚
B.
块低耦合
C.
块独立性
D.
序模块化
【单选题】软件开发的结构化设计(SD)方法,全面指导模块划分的最重要原则应该 ( )
A.
模块高内聚
B.
模块低耦合
C.
模块独立性
D.
程序模块化
【单选题】软件开发的结构化设计(SD)方法,全面指导模块划分的最重要的原则是( )。
A.
模块高内聚
B.
模块低耦合
C.
模块独立性
D.
程序模块化
【单选题】人体发育的起始点是?
A.
卵细胞
B.
受精卵
C.
胎儿
D.
胚泡
【单选题】开发的结构化设计(SD)方法,全面指导模块划分的重要原则应该是()
A.
模块高内聚
B.
模块低藕合
C.
模块独立性
D.
程序模块化
【单选题】软件开发的结构化设计(SD)方法,全面指导模块划分的最重要原则是( )
A.
模块高内聚
B.
模块低耦合
C.
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D.
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【单选题】我们的生活中随处发生着化学变化,下列叙述中,不属于化学变化的是(  )
A.
人吃进的食物逐渐被消化
B.
水在冰箱里结成冰
C.
使用天然气作燃料烧饭做菜
D.
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【单选题】动物和人体发育的起始点是
A.
体细胞
B.
精子
C.
卵子
D.
受精卵
【单选题】人体发育的起始点是 [     ]
A.
卵细胞
B.
受精卵
C.
胚泡
D.
胎儿
【单选题】学习科学知识可以用来辨别“真”、“伪”,通过分析,下列叙述属于“真”的是 [     ]
A.
绿色食品是不含任何化学物质的食品
B.
为延长灯泡的使用寿命,可在灯泡中充入氮气
C.
青少年缺钙会得佝偻病和发育不良,因此需要经常补充钙单质
D.
有人称自己有特异功能,能将普通的铜、铝转变成黄金
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