题型：问答题 简答题 阅读理解。 One midnight, a little girl woke up to pass water. She by herself got up and down her bed, walked to the bedroom door and opened it. She looked outside and walked back, for it was so dark in the hall thatshe feared. Her mother said, "Don't be afraid, honey. Take courage!" "What's courage?" she asked, running to her mother's bed. "Courage is the brave breath," her mother answered. "Mum, do you have courage?" "Certainly." The girl held out her little hands, saying, "Mum, blow some of your breath of courage to me." After her mother blew out two mouthfuls of breath into her little cold hands, the little girl clenched her fists (握拳) nervously, afraid that the"breath of courage" would run away. Then with her fists clenched, she walked out of the bedroom towards the bathroom with nothing to fear. Her mother said to herself,"It will be nice if someone can blow some kind of 'breath' to me. Then I can hold it in my hands too when I feel terrified or lost." In fact, mostly, what we are terrified of is nothing but the fear in our mind. Who we should defeat(战胜) is nobody but ourselves. 1. The girl walked back because ______. [ ]A. the bathroom was too far awayB. her mother wouldn't go with her C. she was too afraid of the dark D. the bedroom door was locked 2. We learn from the reading that ______. [ ]A. the girl went to the bathroom by herself B. the girl pretended to be terrified of nothing C. the girl's mother was able to blow brave breath D. the girl's mother was very proud of herself3. To stop "mother's breath" from running away, the girl ______. [ ]A. held out her little hands B. clenched her fists C. talk to her mother D. held her own breath 4. The writer mainly wants to tell us that ______. [ ]A. adults are always brave enough B. children learn to be brave quickly C. the fear in one's mind is the real problem D. the mother can deal with anything with breath 5. Which is the best title of the passage? [ ]A. The Fearless Mother B. One Lonely GirlC. One midnightD. The Breath of Courage 查看答案
题型：问答题 简答题 如图所示，水平放置的两块平行金属板长l =5cm，两板间距d=1cm，两板间电压为U=90V，且上板带正电，一个电子沿水平方向以速度v0=2.0×107m/s，从两板中央射入，求：（1）电子偏离金属板的侧位移y0是多少？（2）电子飞出电场时的速度是多少？（3）电子离开电场后，打在屏上的P点，若s=10cm，求OP的长。 查看答案
题型：问答题 简答题 网闸产品与防火墙的区别？（）A.防火墙主要采用基于网络层和传输层的访问控制为安全手段B.防火墙具有协议转换、数据摆渡和深度内容分析等安全手段C.网闸在确保安全的前提下实现数据通讯D.网闸是一种隔离设备 查看答案
