问题 单项选择题

一个风险单位,不同时遭受多种风险事故所致单一损失的情况下的损失概率计算。例如,我国南方某企业,在一年内既遭受火灾又遭受水灾,造成企业财产损失。假设该企业遭受火灾的概率为1/50,遭受水灾的概率为1/40,那么该企业在一年内遭受火灾或水灾而至损的概率为()。

A.1/200

B.9/200

C.1/20

D.8/200

答案

参考答案:B

解析:

[考点] 风险的估测。一个风险单位,不同时遭受多种风险事故所致单一损失的情况下的损失概率计算。例如,我国南方某企业,在一年内既遭受火灾又遭受水灾,造成企业财产损失。假设该企业遭受火灾的概率为1/50,遭受水灾的概率为1/40,那么该企业在一年内遭受火灾或水灾而至损的概率为9/200[=(1/50)+(1/40)]。

阅读理解

Americans have contributed (做贡献) to many art forms, and jazz, a type of music, is one of the art forms started in the United States. Black Americans, who sang and played the music of their homeland, created jazz.

Jazz is a mixture of the music of Africa, the work songs the slaves sang, and religious(宗教) music. Improvisation (即兴表演) is an important part of jazz. This is why a jazz song sounds a little different each time it is played.

Jazz bands formed in the late 1800s. They played in bars and clubs in many towns and cities of the South, especially New Orleans. New Orleans is an international seaport, and people from all over the world come to New Orleans to hear jazz.

Jazz became more and more popular. By the 1920s, jazz was popular all over the United States. By the 1940s, you could hear jazz not only in clubs and bars, but in concert halls as well. Today, people from all over the world play jazz. Jazz musicians from the United States, Asia, Africa, South America, and Europe meet and share their music at festivals on every continent. In this way, jazz continues to grow and change.

小题1:What can be the best title of the passage?

A.American Art Forms

B.The Development of Jazz

C.The Music of Black Americans

D.The Birthplace of Jazz小题2:From the text we can learn that ______.

A.New Orleans is the place where jazz was very popular

B.the American people are all jazz lovers

C.jazz is merrily sung by black people when working

D.jazz may become less popular as time goes on小题3:It took about______ years to make jazz popular in the United States.

A.200

B.120

C.80

D.40

判断题