活塞在做功行程将要终了时排气门逐渐打开，汽缸内的气体压力高于大气压，并在上行活塞推动

以下对日清日结法的表述，正确的有（）

A.提高了成本和投入

B.提高了质量和效率

C.增加了员工的心理惰性

D.提高了管理工作的有效性

E.提高了管理工作的及时性

通常将自己的资金存入银行以获取利息的投资者为( )。

A．投机型

B．保守型

C．普通型

D．中间型

某种混合气体由A、B两种可燃气体组成。各组分的浓度及爆炸下限见下表，则这种混合气体的爆炸下限为（）。

A．2.5%

B．3.0%

C．3.3%

D．3.7%

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)

________________________________________________________________________

要使汽车迅速减速，起作用是（）制动装置。

A.行车

B.驻车

C.排气

D.中央