题型：问答题 简答题 某校现有高一学生210人，高二学生270人，高三学生300人，用分层抽样的方法从这三个年级的学生中随机抽取n名学生进行问卷调查，如果已知从高一学生中抽取的人数为7，那么从高三学生中抽取的人数应为______． 查看答案
题型：问答题 简答题 某出口实行先征后退政策的外贸企业收购一批货物出口，收购时取得了增值税的专用发票，注明价款240万元，增值税40.8万元，该外贸企业出口收入(FOB)折合人民币280万元，货物退税率13%，则其外销成本是( )。A．249.6万元B．251.2万元C．262.4万元D．280.8万元 查看答案
题型：问答题 简答题 完形填空 Not long ago I wasn't doing very well in exams and I was full of disappointment and __1__ thinking.While on the Internet,I met many new friends, but one in particular __2__.His nickname is Colorful Day and we __3__ on the Web.He told me: he lost his __4__ at age 15, and felt the whole world had closed its door to him. He was __5__ so fast that I couldn't believe he was blind! But he continued to __6__: Five years ago, I realized it was time to change my life.I had read about Helen Keller and understood her life and __7__.So I developed a website about her life __8__ mine called Three Days to See. I visited his website which was well produced and vividly __9__. I asked, "How did you 10 to build such a website?" He said,"Owing to the new technology, I can use software specially 11 for the blind. 12 I point the cursor(光标), it will just read it out to me. We can do far more things and 13 more information than we could before." I then asked, "Didn't you have great difficulty with it?" He hesitated and then began his 14 with a smiling face," Yes, but I have faith in myself to 15 my colorful day. And modern technology gives me this 16 to do it." His 17 attitude towards life made me believe that our destiny offers not the cup of despair, 18 the chalice (大杯) of opportunity. I returned to my lessons, and this time with a smile on my face and with 19 of a colorful future. The Internet, which opened to me to 20 different lives and cultures, has a charm you couldn't find in another wise nonvirtual world.( )1. A. positive ( )2. A. turned out ( )3. A. argued ( )4. A. eyesight ( )5. A. speaking ( )6. A. follow ( )7. A. friendship ( )8. A. as well as ( )9. A. offered ( )10. A. try ( )11. A. designed ( )12. A. Whether ( )13. A. send ( )14. A. webpage ( )15. A. create ( )16. A. moment ( )17. A. hopeful ( )18. A. but ( )19. A. eagerness ( )20. A. touch B. active B. stood out B. interviewed B. hearing B. saying B. write B. marriage B. such as B. presented B. come B. distinguished B. However B. access B. speech B. produce B. privilege B. disappointed B. and B. expectations B. feel C. negative C. came out C. told C. courage C. typing C. read C. happiness C. like C. delivered C. work C. planned C. Whatever C. communicate C. words C. recognize C. opportunity C. pleasant C. so C. richness C. experience D. instructive D. looked out D. chatted D. confident D. spelling D. copy D. hardships D. as D. found D. manage D. imagined D. Wherever D. exchange D. opinions D. organize D. occasion D. optimistic D. then D. nervousness D. suffer 查看答案
题型：问答题 简答题 水盐代谢：是指人体内调节水盐平衡的机制，保持水和氯化钠的摄入量和排出量的动态平衡，并维持体内含量相对恒定，脱水和水肿是水盐代谢功能失调的两种情况。 下列属于水盐代谢的一项是( )。A．商店售货员卖盐的时候为防止盐化为水，就想办法降低温度B．人在烈日下劳作，大量排汗，体内水分丧失，所以需多喝盐水C．食过酸梅的人，一听到“酸梅”二字，或一看到酸梅，就会分泌唾液D．体力劳动中四肢和躯干协调完成任务 查看答案