作业研究

INTERNET中主机需要实现TCP/IP所有的各层协议，而路由器一般只需实现（）及其以下各层的协议功能。

A.网络互连层

B.应用层

C.传输层

D.网络接口与硬件层

不能从一条已知量效曲线看出的内容是

A．最小有效浓度
B．最大有效浓度
C．最小中毒浓度
D．半数有效浓度
E．效价强度

阅读理解。

     Disposing(处理)of waste has been a problem since humans started producing it．As more

and more people choose to live close together in cities,the waste-disposal problem becomes

increasingly difficult．

During the eighteenth century,it was usual for several neighboring towns to get together to select

a faraway spot as a dump site．Residents or trash haulers(垃圾拖运者)would transport household

rubbish,rotted wood,and old possessions to the site．Periodically some of the trash was burned

and the rest was buried．The unpleasant sights and smells caused no problem because nobody

lived close by．

Factories,mills,and other industrial sites also had waste to be disposed of．Those located on rivers

often just dumped the unwanted remains into the water．Others built huge burners with chimneys

to deal with the problem．

     Several facts make these choices unacceptable to modern society．The first problem is space

Dumps,which are now called landfills,are most needed in heavily populated areas．Such areas

rarely have empty land suitable for this purpose．Property is either too expensive or too close to

residential neighborhoods．Long-distance trash hauling has been a common practice but once farm

areas are refusing to accept rubbish from elsewhere,cheap land within trucking distance of major city

areas is almost nonexistent．

     Awareness of pollution dangers has resulted in more strict rules of waste disposal．Pollution of

rivers,ground water,land and air is a price people can no longer pay to get rid of waste．The amount

of waste,however,continues to grow．

     Recycling efforts have become commonplace,and many towns require their people to take part．

Even the most efficient recycling programs,however,can hope to deal with only about 50 percent of a

city's reusable waste.

1．The most suitable title for this passage would be ______．

A．Places for Disposing Waste

B．Waste Pollution Dangers

C．Ways of Getting Rid of Waste

D．Waste Disposal Problem

2．During the 18th century,people disposed their waste in many ways EXCEPT for ______．

A．burying it

B．recycling it  

C．burning it

D．throwing it into rivers

3．What can be inferred from the fourth paragraph?

A．Farm areas accept waste from the city in modern society．

B．There is cheap land to bury waste in modern society．

C．It is difficult to find space to bury waste in modern society．

D．Ways to deal with waste in modern society stay the same．

4．The main purpose of writing this article is to ______．

A．draw people's attention to waste management

B．warn people of the pollution dangers we are facing

C．call on people to take part in recycling programs

D．tell people a better way to get rid of the waste

息子からの電話かと思ったら、（）。

A.間違い電話でした

B.「もしもし」と言いましょう

C.よろしくお伝えください

D.留守番電話でした

孔子说：“不义而富且贵，于我如浮云。”“富与贵，人之所欲也；不以其道，得知不处也。贫与贱，人之所恶也；不以其道，得之不去也。”材料反映孔子的财富观是（）

A.重义轻利、安贫乐道

B.舍生取义、安贫乐道

C.重道轻义、乐于富贵

D.乐享贫穷、憎恶富贵