问题 单项选择题

某商品流通企业拟定了甲、乙、丙、丁四种经营方案,市场需求可能出现较高、中等、较低三种情况,其概率分布及各种方案在不同需求状态下的损益值如下表。总经理找来主管销售和财务的副总经理深入研究市场状况,要求他们结合各自经验来选择本企业经营方案。请回答以下问题:

自然状态 损益值(万元)
需求量较高 4 9 18 30
需求量中等 8 7 9 -5
需求量较低 2 5 4 -8

总经理听了两位副总经理的决策意见,他认为出现三种状态的概率分别是0.35、0.45、0.20,所以他选择( )。

A.甲

B.乙

C.丙

D.丁

答案

参考答案:C

解析: 甲方案的期望值=4×0.35+8×0.45+ 2×0.20=5.4,乙、丙、丁方案的期望值分别 是7.3、11.15、6.65。丙方案的期望值最大, 所以应选择丙方案。

阅读理解

In my long years of teaching, I often ask my student to read the texts until they can recite them, and I tell them that recitation is an important part of their homework. However, some of my students are tired of doing so, thinking that it is both hard and useless. They argue that it takes a long time to recite a text from memory and text itself never appears in a test paper.

In my opinion, it naturally takes time to recite a text, but it is worth doing so. When you are able to recite a text, you are sure to be familiar with the words and expressions. When you need them in reading or writing or doing exercises, they will come to your mind quickly, and so you will give quick response to all kinds of language situation. How can we say that it is useless?

Besides, many students complain that they soon forget what they were once able to recite. This is true, but you don’t need to worry. While you are reading and forgetting the texts, your language level is being raised. Sure you don’t remember your Chinese texts that you once read in the primary school, but now you are able to read novels and newspaper. So, recitation of the texts will help you improve your language ability.

61. The writer often asks his students to recite the texts,_______.

A.But they don’t like to do so.

B.And they are eager to do so

C.But they wrote a letter to the Department of Education reporting the thing.

D.But they do more exercises instead of reciting the texts.

62. What do the students think about the teacher’s advice?

A.The English teacher tries his best to help them with English.

B.The English teacher is very kind to them.

C.The English teacher asks them to do something useless.

D.The English teacher should let them study on their own.

63. According to the text, which of the following is correct?

A.The teacher thinks the students are too naughty to learn English well.

B.The students think they spend a lot of time in reciting the texts and get nothing.

C.The students say that they often forget the words.

D.The students take no interest in English.

64. When the students are against his suggestion, the writer_______.

A.often criticizes them

B.patiently explains to them why they should recite the texts

C.wants to give up his idea

D.is afraid that he is criticized by the headmaster.

65. Why does the writer suggest that the students recite the text?

A.Reciting the texts can improve the ability of applying English.

B.Reciting the texts is the best way of learning English.

C.The students should remember all the texts that the teacher has taught them.

D.Reciting the texts can greatly improve the classroom teaching.

问答题 简答题