问题 多项选择题

对于供过于求的不平衡运输问题,下列说法正确的是()

A.仍然可以应用表上作业法求解

B.在应用表上作业法之前,应将其转化为平衡的运输问题

C.可以虚设一个需求地点,令其需求量为供应量与需求量之差。

D.令虚设的需求地点与各供应地之间运价为M(M为极大的正数)

E.可以虚设一个库存,令其库存量为0

答案

参考答案:A, B, C

选择题
阅读理解

Dear Michelle,

Why can't my daughter manage her life better? She is 17 and an honor student, but she seems to be wasting her life away with a boyfriend who is holding her back.

He consumes every waking minute of her precious time and smooth-talks her as well.

His goal is to get her to agree to go to the college of his choice, not her choice, and because his grades are lower, his choice will be limited.

I feel like I want to rescue her, but she pushes me away and shuts me out. She has only brought us pride and joy; and now this! Help!

A worried mother

Dear Mother of a 17-year-old Girl,

Hmmmmm. What's the matter with kids today? Remember that song from "Bye Bye Birdie"?

Well if you do not, let me fill you in about teenagers and their life-management skills. Do not expect too much too soon because at the ripe age of 17, life-management is not within their reach, nor should it be.

Life experience creates both the conditions and the skills for management, and if management went before experience, there would be little of it.

Your daughter is an honor student for good reasons. She is smart, studies with intelligence and you have given her good values.

When the time comes for her to apply for college, and she visits the ones that are specifically designed for students at the top of their grade, she will most likely break away from her boyfriend's influence.

It is rare for an honor student to change the path of their academic career for puppy love. That being said, there might be some adolescent wisdom in her behavior after all.

Perhaps she is choosing to worry you, her parents, for unconscious reasons. Being such a good girl and being a steady source of joy might have become a bit too much for her.

Let your daughter have her own private moment of 11th grade rebellion. She deserves a break from perfection.

Michelle

小题1:From the mother's letter we can learn that her daughter              .

A.is being fooled by the boy

B.has fallen behind in her studies

C.doesn't talk much with her mother

D.has chosen which college to attend小题2:According to Michelle, 17-year-old teenagers              .

A.are too young to manage their life

B.are old enough to live their own life

C.should have management before experience

D.have reached the age of an adult小题3:The underlined word "puppy-love" refer to          .

A.false love

B.foolish love

C.pure love

D.adolescent love小题4:Michelle seems to believe that the daughter will finally          .

A.come up with the right decision

B.follow her boyfriend's advice

C.worry her parents for unconscious reasons

D.influence her boyfriend's behavior小题5:The best title for the passage would be           .

A.College of kids' own choice

B.How can I help my girl?

C.How to manage teenagers' life?

D.A 17-year-old girl and her mother