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[单选题]
在各类数据传送方式中，硬件电路最简单的是( )
A.无条件传送方式
B.程序查询方式
C.中断方式
D.DMA方式
A
B
C
D
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试题答案：
A
答案解释：
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在微机系统的发展史中，主流微机系统通常采用三种总线标准,这三种总线分别是ISA总线、_____总线和 _____ 总线。
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30、举例说明激励的作用。?
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单耗相对稳定的外购零部件成本属于( )。
3.
21. Today we remember a man who was considered one of the best teachers in the United States. Jaime Alfonso Escalante was born in 1930 in La Paz, Bolivia. Both his parents were teachers. He taught math and science in his home country for twelve years. In the 1960s, Jaime Escalante and his wife Fabiola came to the United States. During the next several years, he learned to speak English and repeated his college education and teacher training. In 1974, Mr. Escalante was hired at GarfieldHigh School to teach mathematics. The school was in a poor area of Los Angeles, California. Many of the students had serious problems with illegal drugs, gangs and violence. Many were the worst students at the school and thought to be “unteachable”. But Mr. Escalante pushed the group to work hard. He told them basic math was too easy and that they had the ability to do harder work. He told his students that he believed in them, but they must have the desire to be successful. Jaime Escalante started an advanced math program with a small group of students. Advanced Placement is a program of college-level classes and tests. In 1982, 18 of his students took the Advanced Placement test in calculus. They all passed. Officials at the testing company suspected the students of cheating. Mr. Escalante protested. He said the students were being rejected because they were Hispanic and from a poor school. He urged his students to take the test again. Twelve of the students repeated the test. And again, all of them passed. Five earned top scores. Mr. Escalante's students went on to become engineers, scientists and university professors. The advanced math program at Garfield became extremely successful over the next several years. Jaime Escalante received many teaching awards including the Presidential Medal of Excellence in Education. A movie about his success, “Stand and Deliver”, was released in nineteen eighty-eight. It influenced other teachers to use his methods.(10分)21.1 What did Mr. Escalante do after he came to the US?(2分)A. He taught math and science in a local school.B. He went to a college to learn calculus.C. He learned to speak English and got trained on teaching.D. He started an advanced math program in a college.
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世界上面积最大的高原和流域面积最广、流量最大的河流分别是（ ）
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