设c＜b＜0＜a，a+b+c=1，M=b+ca，N=a+cb，P=a+bc，则M

阅读理解。

     Everyone needs friends. We all like to feel close to someone. It is nice to have a friend to talk, laugh,

and do things with. Surely, there are times when we need to be alone. We don’t always want people

around. But we would feel lonely if we never had a friend.

     No two people are just the same. Sometimes friends don’t get along well. That doesn’t  mean that

they no longer like each other. Most of the time they will make up and go on being friends. Sometimes

friends move away. Then we feel very sad. We miss them very much. But we call them and write to

them. It could be that we would even see them again. And we can make new friends. It is surprising to

find out how much we like new people when we get to know them.              

     Families sometimes name their children after a close friend. Many places are named after men and

women who have been friendly to people in a town. Some libraries are named this way. So are some

schools. We think of these people when we go to these places. There’s more good news for people

who have friends. They live longer than people who don’t. Why? It could be that they are happier.

Being happy helps you stay well. Or it could be just knowing that someone cares. If someone cares

about you, you take better care of yourself.

1.The first paragraph tells us _______.

A. none needs friends

B. we always need friends around us

C. making friends is the need in people's life

D. we need to be alone.

2.Which of the following is what the writer doesn't say in the passage?

A. People will feel lonely if they never have friends.

B. People will never see their friends after their friends move away.

C. People can know their friends in different ways.

D. People like their friends very much if they get to know them.

3.People who have friends live longer than people who don't because _______

A. they feel happier and are healthy

B. they get a lot of help from their friends

C. they take better care of themselves

D. both A and C

4. The main idea of this passage is _______.

A. that people are all friends

B. that people need friends

C. how to get to know friends

D. how to name a place

下列关于城市总体规划布局的论述，( )不妥。

A．城市总体布局是城市总体规划的重要工作内容，它是一项为城市长远合理发展奠定基础的全局性工作，并用来指导城市建设，作为规划管理的基本依据之一

B．城市总体布局是在一定的历史时期，一定的自然条件，一定的生产、生活要求下的产物，通过城市用地组成的不同形态体现出来的

C．城市总体布局要根据城市建设发展过程中需要解决的实际问题，按照城市建设发展的一般经验，对城市近期发展项目进行安排，并对远期发展进行初步预见

D．城市总体规划是在城市发展纲要的基本明确，以及城市性质和规模大体确定的情况下，在城市用地评定的基础上，对城市各组成部分进行统一安排，合理布局，使其各得其所，有机联系

通常用（）作为衡量施工企业机械管理水平的主要指标。

A.机械出勤率

B.机械完好率

C.机械利用率

D.机械动力消耗率

我国全国性的旅游行业协会有中国旅游协会，中国旅行社协会等（）个组织。

一种细菌mRNA由360个核苷酸组成，它所编码的蛋白质长度是多少（）

A.约360个氨基酸

B.约1080个氨基酸

C.整120个氨基酸

D.少于120个氨基酸