[多选题]可用性有两个基本定义，即( )
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对所学的知识和技能进行基本检测指的是
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刑事诉讼中证人需要具备的条件包括( )
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阅读下列短文，然后根据短文的内容从每小题的四个选择项中选出最佳的一项。 A After ten years of being a housewife and a mother, Carol could not stand it any longer. Then, one morning,just after her two. daughters had gone to school, she saw an advertisement(广告) in the pa-per. She phoned,and was asked to come to an interview(面谈) that very afternoon. Mr. Hollins,who interviewed her, was a young man about 24 in a blue suit. There was a hard look in his eye and he talked very fast. He told her she would be required to stop men between the ages of 21 and 50 and ask them several questions designed to determine what men think of deodor-ants( 除臭剂). The information was to be recorded and she would be paid according to the number of complete interviews she had. When Carol asked which factory the research was for, she was told that was not important. Last of all, before she began she would have to attend a one-day training. Carol accepted. After the train-ing, which was only about how to write down the answers correctly in a form and how to put the ques-tions, Carol found herself in the center of town at 9:30 in the morning. She soon found out that get-ting the information was really not all that easy. First, she stopped a man who refused to answer any questions because he had no time. Next, a man told her it was none of her business whether he used deodorants or not. Then she interviewed a man who was hard of hearing and, instead of answering her questions, began asking her all sorts of his own. Finally, Carol found a young man with a pleasant smile on his face. He was coming towards her slowly and seemed ready to talk. He looked surprised when she put her first question. "I'm doing a research,too. It's about soap powders,"he said.
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人类历史上关于文艺起源的几种主要观点是（）
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若函数?(x)=2x2-x，则?′(1)=（ ）
