问题 单项选择题

下面描述不正确的是( )。

A.数据元素是数据的基本单位

B.数据元素可有一个或多个数据项组成,数据项是有独立含义的数据最小单位

C.数据的逻辑结构是数据间关系的描述,它是抽象地反映数据元素间的存储关系

D.数据的存储结构是逻辑结构在计算机存储器中的实现

答案

参考答案:C

解析:数据的逻辑结构是数据间关系的描述,它是抽象地反映数据元素间的逻辑关系。注意:在C)选项的“数据的逻辑结构抽象地反映数据元素间的存储关系”是不正确的叙述。

阅读理解

阅读理解

     Directions:Read the following passage.Answer the questions according to the information

given in the passage.

     Jaime Alfonso Escalante was considered one of the best teachers in the United States. He was born

in 1930 in La Paz, Bolivia. He taught math and science in his home country for twelve years.

     In the 1960s, Jaime Escalante and his wife Fabiola came to the United States. During the next several

years, he learned to speak English and repeated his college education and teacher training.

     In 1974, Mr. Escalante was hired at Garfield High School to teach mathematics. The school was in a

poor area of Los Angeles, California. Many of the students in the school had serious problems with illegal drugs, gangs and violence. The school was in danger of losing its official approval to operate.

    Mr. Escalante's students were mostly MexicanAmericans from a Spanishspeaking area of the city.

Many were the worst students at the school and thought to be "unteachable". But Mr. Escalante pushed

the group to work hard. He told them basic math was too easy and that they had the ability to do harder

work.

     Jaime Escalante started an advanced math program with a small group of students. Advanced Placement is a program of collegelevel classes and tests. In 1982, eighteen of his students took the Advanced Placement test in calculus(微积分学). They all passed.

    The officials at the testing company suspected the students of cheating. Mr. Escalante protested(抗议). He said the students were being rejected because they were from a poor school. He urged his students to

take the test again.

     Twelve of the students repeated the test. And again, They all passed. Five earned top scores. Mr.

Escalante's students went on to become engineers, scientists and university professors.

     Jaime Escalante received many teaching awards. A movie about his success, Stand and Deliver, was

released in 1988. It influenced other teachers to use his methods.

    Jaime Escalante retired from teaching in 1998 and later moved back to Bolivia with his wife. He died

when he was seventynine years old.

1. What did Jaime Alfonso Escalante do in the first several years after he moved to the US?(No more

than 11 words)

________________________________________________________________________

2. Why was Garfield High School faced with the risk of being closed down when Jaime Escalante

     joined it? (No more than 15 words)

________________________________________________________________________

3. What made Alfonso Escalante's teaching methods get around? (No more than 9 words)

________________________________________________________________________

4. According to the passage, how long did Jaime Escalante take up teaching all his life? (No more

    than 4 words)

________________________________________________________________________

单项选择题