问题 选择题

将△ABC的三个顶点坐标的横坐标和纵坐标都乘以﹣1,则所得图形与原图形的关系是(  )

A.关于x轴对称

B.关于y轴对称

C.关于原点对称

D.将原图形向x轴负方向平移了1个单位

答案

答案:C

题目分析:根据题意可得新的坐标都是原坐标的相反数,则所得图形与原图形的关系是关于原点对称.

解:△ABC的三个顶点坐标的横坐标和纵坐标都乘以﹣1,则所得新的坐标都是原坐标的相反数,则所得图形与原图形的关系是关于原点对称,

故选:C.

点评:此题主要考查了关于原点对称的点的坐标特点:两个点关于原点对称时,它们的坐标符号相反,即点P(x,y)关于原点O的对称点是P′(﹣x,﹣y).

完形填空

完形填空(共20小题,每小题1.5分,满分30分)

阅读下面短文,掌握其大意,然后从36-55各题所给的四个选项(A,B,C和D)中,选出最佳选项

Grandparents are important and influential persons in all people’s lives. They are those people who take care of you and (36) you. They are special persons who can give you (37) advice.

My grandparents always taught me to (38) others, and they showed me with their (39) that love and feelings are important things in my life and that I don’t have to pay attention to (40) things or what people externally look like.

To (41) my grandparents I have to say that they are beautiful people that I admire because they are so (42) and so healthy.

Even though they are old, they always have a strong (43) to enjoy life. (44), the most important thing is that they are full of love and offer it to other (45).

My grandparents are a huge (46) of culture and nationalities because they come from (47) countries. For example, from my (48) side my grandfather is from Spain, and my grandmother is (49) from Spain, but from a different city. From my father’s side, my grandfather is from Venezuela, and my grandmother is from Italy. Even though this is a huge mixture, my grandparents have a very good (50).

My four grandparents have a goal in common in their lives; their goal is to see our family full of happiness and to see us growing up healthy and happy because they want me and my family to have a successful (51), and so they can prove to themselves that they did a great job (52) my parents.

Furthermore, my grandparents are people that are always in tune to the new things in the world. For example my grandmothers always care about (53), how they dress and their personal appearance. And my grandfathers always (54) economics or important issues in the world.

I think I am very (55) that all of my grandparents are alive because I have learned so much from them.

36. A. love        B. accompany  C. raise    D. protect

37. A. useful.   B. best     C. necessary    D. wise

38. A. help        B. love      C. bless    D. congratulate

39. A. words    B. wishes C. life        D. experience

40. A. cultural  B. mental          C. material       D. rare

41. A. describe         B. introduce     C. discuss         D. retell

42. A. diligent  C. clever  C. active  D. free

43. A. plan        B. desire  C. intention      D. interest

44. A. And yet  B. After all        C. Even so         D. In addition

45. A. people   B. friends C. relations      D. lives

46. A. symbol   B. background C. mixture        D. part

47. A. foreign   B. different       C. other   D. many

48. A. grandfather’s         B. grandmother’s    C. father’s        D. mother’s

49. A. ever        B. even     C. also      D. however

50. A. relationship   B. understanding     C. condition      D. atmosphere

51. A. harmony         B. future  C. job        D. career

52. A. picking up       B. taking up      C. bringing up  D. building up

53. A. clothes  B. food     C. news    D. fashion

54. do with       B. deal with      C. care about   D. look into

55. A. perfect  B. lucky    C. satisfied       D. confident

问答题 简答题