问题 单项选择题

某学院有老师100名,学生3000名,假设老师的打字速度都是90字/分钟,学生的打字速度都是60字/分钟,为使180000字在一小时中正好打完,为使所用人数最少,请问老师和学生分别用多少名?()

A.20,20

B.32,2

C.25,12

D.30,5

答案

参考答案:B

解析:

从题意可知,老师与学生都是足量的,故不用考虑人数的限制,由于老师的打印速度快于学生的打字速度,故应尽可能多的用老师打印会使得总人数最少,由180000个字在1小时正好打印完,可以知道有180000/60=3000字/分钟,设需要老师x名,学生y名,把选项代入90x+60y=3000,由于有人数最少的限制可以从题目中找出人数最少的优先代人运算节约时间,经计算知答案为B。

阅读理解

阅读理解。

     In bringing up children, every parent watches eagerly the child's acquisition (学会) of each new skill-the

first spoken words, the first independent steps, or the beginning of reading and writing. It is often tempting

to hurry the child beyond his natural learning rate, but this can set up dangerous feelings of failure and states

of worry in the child. This might happen at any stage. A baby might be forced to use a toilet too early, a young

child might be encouraged to learn to read before he knows the meaning of the words he reads. On the other

hand, though, if a child is left alone too much, or without any learning opportunities, he loses his natural

enthusiasm for life and his desire to find out new things for himself.

     Parents vary greatly in their degree of strictness towards their children. Some may be especially strict in

money matters, others are sever over times of coming home at night or punctuality for meals. In general, the

controls imposed represent the needs of the parents and the values of the community as much as the child's

own happiness.

     As regards the development of moral standards in the growing child, consistency is very important in

parental teaching. To forbid a thing one day and excuse it the next is no foundation for morality (道德). Also,

parents should realize that "example is better than precept". If they are not sincere and do not practice what

they preach (说教), their children may grow confused and emotionally insecure when they grow old enough

to think for themselves, and realize they have been to some extent fooled. A sudden awareness of a marked

difference between their parents' principles and their morals can be a dangerous disappointment.

1. Eagerly watching the child's acquisition of new skills _____.

A. should be avoided

B. is universal among parents

C. sets up dangerous states of worry in the child

D. will make him lose interest in learning new things

2. When children are learning new skills, parents should _____.

A. achieve a balance between pushing them too hard and leaving them on their own

B. not expect too much of them

C. encourage them to read before they know the meaning of the words they read

D. create as many learning opportunities as possible

3. The second paragraph mainly tells us that _____.

A. parental restrictions vary, and are not always for the benefit of the children alone

B. parental controls reflect only the needs of the parents and the values of the community

C. parents should be strict with their children

D. it's parents'and society's duty to control the children

4. The word "precept" in Paragraph 3 probably means "_____".

A. idea

B. punishment

C. instruction

D. behaviour

5. In moral matters, parents should _____.

A. satisfy their children's needs

B. be aware of the marked difference between adults and children

C. forbid things which have no foundation in morality

D. observe (遵守,奉行) the rules themselves

单项选择题