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从Windows环境进入MS-DOS方式后,返回Windows环境的DOS命令为【 】。

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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.

A. results
B. exams
C. atmosphere
D. homework

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.

A. gather
B. meet
C. group
D. talk

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().

A. Disappointed and unhappy.
B. Angry and annoyed.
C. Excite

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