设有属性A,B,C,D,以下表示中不是关系的是A． B．R(A,B,C,D) C．R 发布时间：2018-01-09 11:30 │ 来源：www.tikuol.com 题型：单项选择题 问题： 设有属性A,B,C,D,以下表示中不是关系的是A．B．R(A,B,C,D)C．R(A×B×C×D．R(A,
题型：单项选择题 阅读并回答问题。使至塞上王维 单车欲问边，属国过居延。 征蓬出汉塞，归雁入胡天。 大漠孤烟直，长河落日圆。 萧关逢候骑，都护在燕然。（1）本诗从体裁上看，是一首 诗。 （2）本诗首联交代了 和 。 （3）说一说本诗中写得最精彩的是哪两句？写出了什么意境？你能用画笔描绘出来吗？_____________________________________________________________（4）找出本诗中的对偶句，并用自己的话解释一下。_____________________________________________________________ 查看答案
题型：单项选择题 完型填空。 If you are the best of the class. In the last few exams, one or two even several students 1 higher marksthan you. 2 do you think about this? Are you jealous of them? Or are you 3 them? Please think it 4 after reading the following passage.You will probably learn 5 . Once a zoologist (动物学家) 6 antelopes (羚羊) which were living on both sides of a river in the Republic of South Africa.He discovered that the antelopes on the east side multiplied (繁殖) more quickly and ran faster than 7 on the west. The zoologist 8 after long,deep thought about the difference,as two groups of antelopes lived in the same environment and they 9 same kind of grass.One year 10 the help of the Animal Protecting Society,he caught ten antelopes on each side and exchanged them. A year later,the ten antelopes sent to the west bank multiplied by fourteen while only three of the ones sent to the east remained. Where are 11 seven? They had been 12 by wolves. At last the zoologist understood why the antelopes on the east were stronger.That was 13 on the east side there were living a group of wolves ---their natural enemy! Now everything is plain sailing in 14 life.It's your opponents(对手)that you are improving indeed,so 15 must go to your opponents.It's true! ( )1. A. have made ( )2. A. Where ( )3. A. afraid at ( )4. A. about ( )5. A. little ( )6. A. learned ( )7. A. that ( )8. A. understood( )9. A. fed on ( )10. A. under ( )11. A. another ( )12. A. caught ( )13. A. why ( )14. A. your ( )15. A. cries B. have drawn B. What B. angry with B. out B. a few B. noticed B. ones B. wondered B. offered B. for B. other B. eaten B. where B. our B. greetings C. have got C. Why C. pleased with C. over C. few C. found C. those C. solved C. provided C. at C. the other C. taken C. because C. my C. laughter D. have lost D. How D. grateful to D. of D. a lot D. worked on D. these D. known D. grew up D. with D. others D. kept D. wherever D. their D. thanks 查看答案