Questions 21 to 25 are based on the following passage.
Today people all over the world are beginning to hear and learn more and more about the problem of pollution.Pollution is caused either by man’s release of completely new and often artificial substances into the environment, or by releasing greatly increased amounts of natural substance，such as oil from oil tankers into the sea.
The whole industrial process，which makes many of the goods and machines we need and use in our daily life, is bound to create a number of waste products which upset the ecological balance.Many of those waste products can be disposed of sensibly, but when more new goods are produced，there will be new, dangerous wastes to be disposed of.Many people，therefore，see pollution as only part of the larger and more complex problem—the whole process of industrial production and consumption of goods.Others again see the problem mainly in connection with agriculture，where new methods make farmers grow more on their land to feed population.However，the land itself is gradually becoming worn out as it is be-mg used.Chemical mixture cannot restore the balance.
Whatever its underlying causes，there is no doubt that much of the pollution problem could be controlled if only everyone would make more effort.In the home there is an obvious need to control little and waste.Food comes wrapped up three or four times in packages that all have to be disposed of;drinks are increasingly sold in bottles or tins which cannot be reused.This not only causes a litter problem，but also is a great waste of resources.Advertising has helped this process by persuading many of us not only to buy things we neither want nor need but to throw away much of what we do buy.So we call solve pollution problems by cutting out excess consumption.unnecessary buy and so on.
1.When we say that people are beginning to hear and learn more and more about
The problem of pollution，we mean that___.
A.this problem is becoming the center of public concern
B.people are using products largely made of new and often artificial substances
C.the media is paying more and more attention to this problem
D.people are being better educated about the problem of pollution
2.The major environmental problem caused by industrial process is___.
A.the increased production of new goods
B.the creation o0f new products
C.the sensible disposal of the increasing industrial wastes
D.the creation of new wastes
3.The major environmental problem with agriculture is caused by___.
A.the increased population farmers have to feed
B.the worn-out farmland
C.the restoration of the balance of the farm land
D.the new methods of farming involving the use of chemical fertilizer
4.In the 1ast paragraph，it is implied that___.
A.the packaging problem only makes the pollution worse
B.people should consume less to prevent me problem of pollution
C.advertising plays a positive role in controlling the problem of pollution
D.the problem of pollution can only be solved if we buy less
5.The passage mainly deals with___.
A.the causes of pollution and possible solutions
B.pollution in a broad sense
C.the ecological balance
D.the industrial and agricultural pollution
6.“一个产品可以很轻松地从网络上下载和被复制”描述的数字产品特点是( C ) A.可比性
7.“卖者的数目很多，但规模很小，每个生产者都不能影响价格”描述的市场结构是( C )
A.垄断 B.垄断竞争 C.完全竞争 D.寡头垄断
8.在UN/EDIFACT中规定，电子单证的基本单元是( B )
A.报文 B.数据元 C.数据段 D.电子单证子集
9.电子商务采购的卖方模式、买方模式和第三方模式，实际上都是( C )
A.020模式 B.C2C模式 C.B2B模式 D.B2C模式
10.下列能够反映电子商务物流柔性化特征的是( D )
A.单品种 B.批量大 C.批次少 D.周期短
11.一座房屋遭受火灾，大火烧毁了该房屋。该损失属于( )P 2004年10 月
13.从风险角度讲，火灾、爆炸、雷电、船舶碰撞，人们死亡或生病等都是( )P 2004年10 月
14.与人的疏忽或过失相关的风险因素称为( )P 2004年10 月
15.以社会经济的变动为直接原因的风险，被称为( )P 2004年10 月
A、暂定价格 B、部分固定价格 C、具体价格待定 D、固定价格
19、对于一些造型上有特殊要求的商品，如服装等，经常用 表示品质。( )
A、看货买卖 B、凭样买卖 C、凭价格买卖 D、固定价格
20、《跟单信用证统一惯例》规定，交货数量有不超过 的增减幅度。( )
A、5% B、10% C、15% D、20%