单选题若f(x)为可导函数，f(x)＞0，且满足则f(x)=______

单选题Some pessimistic experts feel that the automobile is bound to fall into disuse. They see a day in the not-too-distant future when all autos will be abandoned and allowed to rust. Other authorities, however, think the auto is here to stay. They hold that the car will remain a leading means of urban travel in the foreseeable future. The motorcar will undoubtedly change significantly over the next 30 years. It should become smaller, safer, and more economical, and should not be powered by the gasoline engine. The car of the future should be far more pollution-free than present types. Regardless of its power source, the auto in the future will still be the main problem in urban traffic congestion. One proposed solution to this problem is the automated highway system. When the auto enters the highway system, a retractable (可伸缩的) arm will drop from the auto and make contact with a rail, which is similar to those powering subway trains electrically. Once attached to the rail, the car will become electrically powered from the system, and control of the vehicle will pass to a central computer. The computer will then monitor all of the car's movements. The driver will use a telephone to dial instructions about his destination into the system. The computer will calculate the best route, and reserve space for the car all the way to the correct exit from the highway. The driver will then be free to relax and wait for the buzzer that will warn him of his coming exit. It is estimated that an automated highway will be able to handle 10,000 vehicles per hour, compared with the 1,500 to 2,000 vehicles that can be carried by a present-day highway.

单选题The poor girl couldn't ______ from her tears any more when her mother showed up.

单选题李某系郑州市某出租汽车公司司机，住郑州市金水区。2012年11月26日晚，香港居民孙某在郑州市中原区乘坐李某驾驶的出租车至中原区某快捷酒店，下车时将背包遗忘在车上，内有4万元现金。孙某下车后即意识到背包遗忘在车上，于是找到李某，向其索要。李某谎称并未见到背包，拒不交出。该案一审应当由哪个法院优先管辖 ( )

单选题Alan Chang was a handsome young man with good manners. One morning he was walking along a street on his way to an appointment. He did not want to be early or late. He had forgotten to put on his watch so he went up to a maris who was waiting for a taxi. "Excuse me, sir," he said, very politely, "but could you tell me the time?" The man, who was very well-dressed and looke quite rich, said nothing. He did not even look at Alan. Alan spoke to him again. "Excuse me, sir," he said, "but could you please tell me what time it is?" This time the man looked at him, but he did not speak and looked quickly away. Alan thought to himself: well, he can hear me: he must be just rude. So Alan asked again, "Why wouldn' t you tell me the time, sir?" The man turned towards him and said, " Put yourself in my shoes . I am standing here waiting for a taxi. You come up to me and ask me for the time. If I tell it to you, you will thank me. I will say ' That' s all right. ' You may then say ' It' s a beautiful day. ' to which I may reply 'Yes, I like these sunny winter days. ' Before we know what is happening, we have a friendly conversation. You are a pleasant, polite young man, so when my taxi comes, I offer you a ride. You accept. We talk. I like you. You like me. I invite you to my home. You meet my daughter. She is a very pretty girl. You are a good-looking man. You like each other. Soon you fall in love. You want to marry. Now do you understand my problem?" Alan shook his head. " No, sir, I'm sorry, I don 't. Everything you have said seems very natural to me. " " Exactly," the man said, " and I do not want my daughter to marry a man who is too poor to buy a watch. Good morning to you. " And with these words he hurried away.

单选题Don't put too much pressure on the children, because anxiety can______with their performance at school.

单选题设函数f(x)有连续的二阶导数，且f"(0)=0，，则______

单选题目前很多高校都实施了“学评教”活动，高校对教学的这种控制活动属于 ( )

单选题下列极限存在的是______A．B．C．D．

单选题以下属于高级语言的是 ( )

单选题下列关于无线局域网的叙述，错误的是______

单选题古希腊学者阿基米德在浴缸洗澡时突然发现浮力定律，解决了“王冠之谜”。这种思维是 ( )

单选题( )是指心理活动表现在强度、速度、稳定性和灵活性等方面的心理特征。

单选题《战国策》的体例属于( )

单选题肝硬化时，门脉高压症不包括______

单选题在Word 2003中，要调节行间距，则应该选择 ( )

单选题肉芽组织中抗感染的主要成分是( )

单选题下列关于数据库技术的叙述，错误的是____________。

单选题确定合理的管理幅度是进行组织设计的一项重要内容。关于什么是合理的管理幅度，下列四种说法你最赞同哪一种( )。

单选题均匀分布是由于种群成员之间进行什么引起的______