完形填空

　It is true that paper cannot last long．But is there any 　1　that would last as long as 　2　and as easy to write 　3　as paper? The Babylonians 　4　just such a material．Recently an Englishman 　5　 a large library of a king of the Babylonia, whose 　6　were made of clay (粘土)．

　This is the 　7　 these books were made．They 　8　made a sheet of clay of the proper 　9　 and thickness, and 　10　 on it with a sharp stick．These books of clay, 　11　 they had been dried and 　12　in an oven (炉灶), could last 　13　 as long as stone．Such books will not 　14　up in a fire 　15　 be spoiled (损坏) by wetness; nor will they be 　16　 by mice or rats．It is true that they colud be 　17　, but the pieces can be gathered up and 　18　together．The Englishman 　19　to work a long time with broken sheets discovered there before he 　20　 them all put together properly．

　There were 30,000 sheets in library．Every book was made 　21　 many sheets, as our books have many 　22　．It was, of course, impossible to 　23　them together as we 　24　now with our books．So all the clay sheets had to be 　25　and the name of the book placed on every one．

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两处为多余选项。
To extinguish （熄灭） different kinds of fires, several types of fire extinguishers have
been invented．   1____. Most portable （手提式的） kinds operate for less than a minute,
so they are useful only on small fires．The law requires ships, trains, buses and planes to carry
extinguishers．
Since fuel, oxygen （氧气） and heat must be present in order for fire to exist, one or more of these things must be removed or reduced to extinguish a fire．   2_____． The cooling method is the most common way to put out a fire．Water is the best cooling material because it is low in cost and easy to get．
____3____. This is usually done by covering the fire with sand, steam or some other things．A blanket may be used do cover a small fire．
A third method is called separation．_____4______．
The method that is used to put out a fire depends upon the type of fire．Fires have been grouped in three classes．____5____. These materials usually help keep the fire on．Such fires can be stopped most readily by cooling with water．

A．Fire extinguishers should be available everywhere in our life．

B．They must be ready for immediate use when fire breaks out．

C．Where a fire breaks out, there will surely be unavoidable damage．

D．Fires in wood, paper, cloth and the like are called Class A fires．

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两处为多余选项。

To extinguish （熄灭） different kinds of fires, several types of fire extinguishers have

been invented．   1____. Most portable （手提式的） kinds operate for less than a minute,

so they are useful only on small fires．The law requires ships, trains, buses and planes to carry

extinguishers．

Since fuel, oxygen （氧气） and heat must be present in order for fire to exist, one or more of these things must be removed or reduced to extinguish a fire．   2_____． The cooling method is the most common way to put out a fire．Water is the best cooling material because it is low in cost and easy to get．

____3____. This is usually done by covering the fire with sand, steam or some other things．A blanket may be used do cover a small fire．

A third method is called separation．_____4______．

The method that is used to put out a fire depends upon the type of fire．Fires have been grouped in three classes．____5____. These materials usually help keep the fire on．Such fires can be stopped most readily by cooling with water．

    A．Fire extinguishers should be available everywhere in our life．

    B．They must be ready for immediate use when fire breaks out．

    C．Where a fire breaks out, there will surely be unavoidable damage．

    D．Fires in wood, paper, cloth and the like are called Class A fires．

    E．Another method of extinguishing fire is by cutting off the oxygen．

    F．If the heat is reduced by cooling the material below a certain temperature, the fire goes out．

    G．It includes removing the fuel, or material easy to burn, from a fire, so that it can find no fuel.

　　It is true that paper can not last long. But is there any 1 that would last as long as 2 and as easy to write on as paper? The Babylonians 3 just such a material. Recently an English man unearthed a large 4 of a king of Babylonia, whose 5 were made of clay (陶土).

　　This is the 6 these books were made. They just made a sheet of clay of proper 7 and thickness, and wrote on it with a sharp stick. These books of clay, 8 they had been dried and 9 in an oven (炉), could last 10 as long as stone. Such books will not 11 up in a fire 12 be spoiled (损坏) by wetness; nor will they be 13 by mice or rats. It is true that they could be 14 , but the pieces can be gathered up and 15 together. The Englishman had to work a long time with broken sheets discovered there before he 16 them all put together properly.

　　There were 30,000 sheets in the library.

　　Every book was made up of many sheets, as our books have many 17 . It was, of course, impossible to 18 them together as we 19 now with our books. So all the clay sheets had to be 20 and the name of the book placed on every one.

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