问题 选择题

点P(2,-1)关于原点中心对称的点的坐标是(     )

A.(2,1)

B.(-2,-1)

C.(-1,2)

D.(-2,1)

答案

D.

题目分析:平面直角坐标系中任意一点P(x,y),关于原点的对称点是(-x,-y).

根据中心对称的性质,得点P(2,-1)关于中心对称的点的坐标为(-2,1).

故选D.

考点: 关于原点对称的点的坐标.

完形填空

第二部分:语言知识及运用(共两节,满分35分)

第一节:完形填空(共10小题;每小题2分, 满分20分)      

阅读下面短文,从各题所给的四个选项A、B、C、D中选出最佳选项。

The guitar is one of the oldest instruments known to man. It   21   originated in the vicinity of (在……附近) China. There were guitars in ancient Egypt and Greece as well, but the   22   history of the guitar started in Spain in the 13th century. By 1500 the guitar was   23   in Italy, France, and Spain. A French document of that time   24   that many people were playing the guitar. Stradivarius, the famous king of violin makers, could not resist   25   a variety of guitars. Also, there was no lack of music written for the instrument. Haydn, Schubert, and others   26   guitar music. When Beethoven was asked to compose music for the guitar, he went into a rage(大怒) and   27  , but eventually even Beethoven could not ignore the   28  .Legend tells us he finally called the guitar a miniature orchestra. Indeed the guitar does   29   like a little orchestra! Perhaps that is why in rural areas around the world the guitar has been a source of   30   for millions to enjoy.

21. A. certainly             B. mainly                     C. probably           D. partly

22. A. written                      B. learned              C. found                D. spoken

23. A. acceptable           B. popular            C. familiar             D. available

24. A. predicted            B. warned              C. denied               D. recorded

25. A. destroying           B. accusing            C. creating             D. following

26. A. enjoyed                     B. wrote                C. accepted            D. commented

27. A. refused               B. accepted            C. failed                D. escaped

28. A. contribution        B. challenge           C. history                     D. suggestion

29. A. look                   B. feel                   C. taste                  D. sound

30. A. intelligence         B. energy                     C. music                D. spirit

单项选择题