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阅读下面短文，从短文后所给各题的四个选项([A]、[B]、[C]和[D])中选出能填入相应空白处的最佳选项。 Some students at the Open University left school 20 years ago. (36) are younger but all must be at least 21 years old. This is one example of (37) the Open University is different (38) all the others. Its students must (39) work fulltime or be at home all day. They do not have to (40) any examinations before they are (41) . This is why the university is called "open". It was started (42) order to help people who (43) having a university education when they were young. The first name (44) the open university was "the University of the Air". The idea was to teach (45) the air, in other (46) , on radios and the television. (47) of the teaching is done like this. The student also receives (48) at one of 283 study centers in the country. He must also (49) three weeks every summer as a (50) student. Tutors and students (51) and study together, (52) in other universities. At the end of the Open University’s first year, the (53) were good; three (54) of four students passed their examinations. (55) they do this every year, they will finish their studies in four or five years.
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阅读下面短文，从短文后所给各题的四个选项([A]、[B]、[C]和[D])中选出能填入相应空白处的最佳选项。 Some students at the Open University left school 20 years ago. (36) are younger but all must be at least 21 years old. This is one example of (37) the Open University is different (38) all the others. Its students must (39) work fulltime or be at home all day. They do not have to (40) any examinations before they are (41) . This is why the university is called "open". It was started (42) order to help people who (43) having a university education when they were young. The first name (44) the open university was "the University of the Air". The idea was to teach (45) the air, in other (46) , on radios and the television. (47) of the teaching is done like this. The student also receives (48) at one of 283 study centers in the country. He must also (49) three weeks every summer as a (50) student. Tutors and students (51) and study together, (52) in other universities. At the end of the Open University’s first year, the (53) were good; three (54) of four students passed their examinations. (55) they do this every year, they will finish their studies in four or five years.
以下程序的功能是：输出100以内(不含100)能被3整除且个位数为6的所有整数,请填空。 main() (int i,j； for(i=0；【 】；i++) {j=i*10+6； if(【 】)continue； printf("％d",j)； } }
Hello, everyone. I’d like to tell you a story about Miss Richards.Miss Richards was a teacher at a school for boys and girls. She taught chemistry and physics from the lowest to the highest classes in the school. Sometimes the new classes learned rapidly, but sometimes they were very slow, and then Miss Richards had to repeat things many times.One year, the first class had been studying chemistry for several weeks when Miss Richards suddenly asked, "What is water Who knows Hands up."There was silence for a few seconds, and Miss Richards felt sad but then one boy raised his hand. "Yes, Dick" said Miss Richards encouragingly. He was not one of the brightest students in the class, so she was glad this boy could answer."Water is a liquid which has no color until you wash your hands in it, then it turns black," the boy replied. How did Miss Richards feel before Dick answered her question().
What are the chances that we will encounter some alien form of life, as we explore the galaxy.If the argument about the time scale for the appearance of life on Earth is correct, there ought to be many other stars, whose planets have life on them. Some of these stellar systems could have formed 5 billion years before the Earth. So why is the galaxy not crawling with self designing mechanical or biological life forms Why hasn’t the Earth been visied, and even colonized. I discount suggestions that UFOs contain beings from outer space. I think any visits by aliens would be much more obvious, and probably also, much more unpleasant.What is the explanation of why we have not been visitedOne possibility is that the argument about the appearance of life on Earth is wrong. Maybe the probability of life spontaneously appearing is so low that Earth is the only planet in the galaxy, or in the observable universe, in which it happened.Another possibility is that there was a reasonable probability of forming self-reproducing system, like cells, but most of these forms of life did not evolve intelligence.A third possibility is that there is a reasonable probability for life to form, and to evolve to intelligent beings, in the external transmission phase. But at that point, the system becomes unstable, and the intelligent life destroys itself. This would be a very pessimistic conclusion. I very much hope it isn’t true.I prefer a fourth possibility: there are other forms of intelligent life out there, but we have been overlooked. There used to be a project called SETI, the search for extraterrestrial intelligence. It involved scanning the radio frequencies, to see if we could pick up signals from alien civilizations. I thought this project was worth supporting, though it was cancelled due to a lack of funds. But we should have been wary of answering back, until we have developed a bit further. Meeting a more advanced civilization, at our present stage, might be a bit like the original inhabitants of America meeting Columbus. I don’t think they were better off for it. What does the word "discount" (Line 6, Para. 1) most probably mean according to the context （）
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