问题 解答题

根据以往统计资料,某地车主购买甲种保险的概率为0.5,购买乙种保险但不购买甲种保险的概率为0.3。设各车主购买保险相互独立。

(1)求该地1位车主至少购买甲、乙两种保险中的1种的概率;

(2)求该地3位车主中恰有1位车主甲、乙两种保险都不购买的概率。

答案

解:记A表示事件:该地的1位车主购买甲种保险;

B表示事件:该地的1位车主购买乙种保险但不购买甲种保险。

C表示事件:该地的1位车主至少购买甲、乙两种保险中的1种;

D表示事件:该地的1位车主甲、乙两种保险都不购买;

E表示事件:该地的3位车主中恰有1位车主甲、乙两种保险都不购买。

(1)P(A)=0.5,P(B)=0.3,C=A+B

P(C)=P(A+B)=P(A)+P(B)=0.8。

(2)D=,P(D)=1-P(C)=1-0.8=0.2

P(E)=

解答题
完形填空

第二节完形填空(共20小题;每小题1.5分,满分30分)

阅读下面的短文,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,并在答题卡上将该项涂黑。

“Hi, Mommy, what are you doing?” asked Susie, who was only six years old. “I’m making a casserole(炖锅菜) for Mrs. Smith next door, __36__ Mrs. Smith is very sad. She lost her daughter and has a __37__ heart. We need to take care of her a little while.” Said her mother. “ Why, Mommy?” 

“You see, Susie, when someone is very, very sad, they have __38__ doing the little things like making dinner or other housework. Because we’re __39__ of a community and Mrs. Smith won’t ever be able to talk with her daughter or hug(拥抱) her. You are a very __40__ girl, Susie; maybe you’ll think of __41__ way to help take care of Mrs. Smith.”

Susie thought __42__ about this challenge and how she could do her __43__ on caring for Mrs. Smith. A few minutes later, Susie knocked on her door. After a few moments, Mrs. Smith __44__ the knock with a “Hi, Susie.”

Susie noticed that Mrs. Smith didn’t have that familiar musical __45__ about her voice when she __46__ someone.

“What can I do for you, Susie?” asked Mrs. Smith.

“My mommy says that you lost your daughter and you’re very, very sad with a broken heart.” Susie __47__ her hand out shyly. In it was a Band-Aid. “This is for your broken heart.” Mrs. Smith knelt down and hugged Susie. Through her __48__ she said, “Thank you, darling girl, this will __49__ a lot.”

Mrs. Smith __50__ Susie’s act of kindness and took it one step __51__. She bought a small key ring with a picture frame(框架) ---- the ones __52__ to carry keys and display a family __53__ at the same time. Mrs. Smith placed Susie’s Band-Aid in the frame to __54__ her to heal a little every time she sees it. It has become her symbol(象征) for healing, while not __55__ the joy and love she experienced with her daughter.

36. A. although      B. because      C. when D. so

37. A. broken  B. absent C. sick    D. gentle

38. A. trouble B. time    C. interest       D. danger

39. A. owners        B. whole C. part    D. relatives

40. A. naughty       B. little   C. pretty  D. smart

41. A. the other      B. the very     C. our     D. some

42. A. seriously      B. deeply C. much        D. little

43. A. job       B. work   C. part    D. deed

44. A. replied  B. answered to      C. greeted       D. responded

45. A. sound   B. quality       C. gift     D. note

46. A. praised B. helped C. greeted       D. saw

47. A. gave     B. set      C. took    D. held

48. A. tears     B. sadness       C. excitement  D. glasses

49. A. do B. care    C. mean  D. help

50. A. refused B. accepted     C. received     D. took

51. A. more    B. forward      C. further       D. ahead

52. A. made    B. bought       C. invented     D. designed

53. A. photo   B. scene  C. gathering   D. life

54. A. force    B. remind       C. get      D. advise

55. A. forgetting    B. missing      C. losing D. remembering