下列属于HLAⅡ类分子的是（） A.HLA-B分子 B.HLA-A分子 C.

Most people want to work, but in today’s word ,it is more difficult to find work for everybody.The economics of the world need to grow by 4% each year just to keep the old number of jobs for people.

Often this is not possible,and so more people are out of work.

Some people have no jobs now because new machines can do the work of many people do in a short time.Also, machines do not ask for more money and longer holidays. In all the countries of the world, machines are taking work from people ,not only in factories but also on the farms.

One machine can often do the work of forty people. About 75,000 people are moving to the cities a day to look for jobs ,but only 70% of them can find jobs .

小题1:The economics of the world need to grow to______.

A．get more money

B．keep the old number of jobs of people

C．make new machines

D．let people look for jobs小题2:Some people are out of work because _______.

A．of the machines

B．they are old

C．they ask for more money and longer holidays

D．they want to move to the cities小题3:About machines,which of the following is NOT　RIGHT?________.

A． Machines can do the work of many people do in a short time.

B． Machines do not ask for more money and holidays.

C． Two machines can do the work of eighty people.

D． Machines cant’t take work from people at all.小题4:.How many people can’t find jobs every day _______?

A．75,000

B．52500

C．22500

D．52500小题5:.From the passage, we know _______.

A． it’s not possible for everybody to find work.

B． Machines can only take work from people in factories.

C． In the future , there will be enough jobs for everybody

D． Machines will do the work instead of people

在路由表中，哪个网络地址表示的是路由器或主机的默认路由？（）

A.0.0.0.0

B.127.0.0.0

C.224.0.0.0

D.255.255.255.255

化简：x³÷（﹣x）³·（﹣x）²=（    ）．

简述中学跑、跳、投教材的分布与特点。

标准指出，最小条件是评定（）误差的基本原则。

A.垂直

B.位置

C.形状

D.平行