完形填空

阅读下面的短文，从A、B、C 、D四个选项中选出最佳选项。

　　Many men tried to fly like birds．They made wings 　1　 themselves，usually of feathers，and tried to fly 2 moving their wings as a bird 　3　 None of them 　4　．A bird has a very 　5　 body but very strong wing 　6　．A man，on the contrary，has a 　7　 body and not very strong arm muscles．A man will 　8　 fly like a bird．His muscles are not strong enough．He can only fly properly 　9　 with an engine．

　　There is kind of plane which doesn't have an engine．It 　10　 a glider（滑翔机）．It is very light and can carry 　11　 one or two people．It is pulled into the air rather like flying a kite，usually from a 　12　 place if there is a good 　13　，it can rise into the air and sometimes cover long 　14　 but usually it soon glides gently back to 　15　 ．

　　Some men did not find sitting in a glider exciting enough．They wanted to glide by 　16　 wings，like the“bird men”of old 　17　．But the wings of he modem“ bird men” were 　18　．They were 　19　 ．They were not made 　20　 feathers．

1．

[　　]

2．

[　　]

3．

[　　]

4．

[　　]

5．

[　　]

6．

[　　]

7．

[　　]

8．

[　　]

9．

[　　]

10．

[　　]

11．

[　　]

12．

[　　]

13．

[　　]

14．

[　　]

15．

[　　]

16．

[　　]

17．

[　　]

18．

[　　]

19．

[　　]

20．

[　　]

Cloud seeding is a method of artificially causing clouds to produce precipitation （降水） in the form of rain or snow．Cloud seeding has also been used in attempts to modify the severity of hail storms and hurricanes．The effectiveness of cloud seeding remains controversial （有争议的）．but it continues to be used in some regions to try to increase rainfall for agriculture and to build snow packs for water supplies and power production．

Cloud seeding was developed by American scientists Irving Langmuir and Vincent Joseph Schaefer during and after World War II．Their work began as an effort to learn more about the buildup of ice on airplane wings, and eventually led them to attempt to create rainfall by releasing several pounds of crushed frozen carbon dioxide into a cloud from an airplane．In this form, the carbon dioxide is called dry ice．On November 13, 1946, the technique appeared to produce snow directly under the cloud; the snow then turned to rain as it fell to the ground．

For their experiment, Langmuir and Schaefer selected a supercooled cloud, one in which the water droplets remain liquid in subfreezing temperatures．Their theory was that small grains of dry ice falling through the cloud would cause tiny droplets of water vapor in the cloud to freeze into crystals that attracted more water vapor．Their theory proved to be correct and eventually the crystals became heavy enough to fall from the cloud as snow．As the snow reached the warmer temperatures closer to the ground, it melted and became rain．

Another scientist, Bernard Vonnegut, produced a method of cloud seeding using silver iodide （碘化银）．He used particles of silver iodide because its crystal structure resembled that of ice in clouds．Silver

iodide also had practical advantages over frozen carbon dioxide It could be stored at room temperature

and did not require an airplane as a delivery mechanism．Instead, silver iodide crystals could be fired by

cannons （大炮） high into the air, where wind carried them into the clouds．

1.According to the text, Langmuir and Schaefer had intended to deal with__

A．how to freeze carbon dioxide??????????????????????

B．how to remove ice on plane wings

C．how to make weather forecast for the war?????????????

D how to hide planes in clouds at war

2.What is the CORRECT order of the course for cloud seeding with dry ice?

a．snow becoming rain in wanner temperatures???????????? b．crystals attracting more water vapor

c．crystals falling in the form of snow???????????????????? d．crystals becoming very heavy

e．freezing tiny droplets of water vapor into crystals

f．putting small grains of dry ice in the cloud

A．a-c-f-d-b-e??????????????? ????????????? B．b-f-e-a-c-d????????????

C．f-e-b-d-c-a??????? ????????????? D．e-a-d-c-b-f

3.Bernard chose silver iodide as a method of cloud seeding because___．

A．it is much cheaper than dry ice?????? ????????????? B．it can be stored at any rooms

C．it can be sent into clouds by wind?? ????????????? D．it is similar

4.The best title for the passage may be "____"．

A．Cloud Seeding?????? ?????????????

B．Artificial Raining???????

C．Weather Changing

D．Cloud Gathering

5.How many methods of cloud seeding are mentioned in the passage?

A．three ????????????? B．two?????? ????????????? C．one????????????? D.four

完形填空

　　What kind of homes will we live in in the future? (1) can be sure, but scientists are working (2) new ideas now.

　　Some scientists are (3) about building whole cities under huge glass domes(圆顶). (4) advanced heating and cooling systems will be (5) to control the weather in the domes. (6) there will never be any (7) or snow, and the temperature will always be (8) .

　　Perhaps everyone will live in vertical(垂直) cities——high rises (9) are so large that they can (10) all the necessities of life. Since vertical cities will use (11) land than flat cities, and provide homes (12) mote people, they will be practical for small countries that have (13) population.

　　 (14) idea that will be helpful to small countries is the (15) city. Monaco has already built homes, stores, and offices (16) the water of the Mediterranean Sea.

　　There are some people who think that we will go back to (17) in caves. (18) the caves of the future will be very different from the caves of the Stone Age. Farms and parks will be on the land (19) the cave city. When people want to go to the country or to a park, a short ride in a (20) will take them there.

(1)

[　　]

A．Somebody　　　　　　B．Anybody

C．Nobody　　　　　　　D．Everybody

(2)

[　　]

A．off　　　　　　　　　B．out

C．in　　　　　　　　　 D．by

(3)

[　　]

A．thinking　　　　　　　B．considering

C．imagining　　　　　　D．suggesting

(4)

[　　]

A．On the other hand　　　B．As a result

C．Of course　　　　　　  D．At the same time

(5)

[　　]

A．possible　　　　　　　B．suitable

C．pleasant　　　　　　　D．necessary

(6)

[　　]

A．Similarly　　　　　　B．Therefore

C．According to　　　　 D．Moreover

(7)

[　　]

A．cloud　　　　　　　B．rain

C．wind　　　　　　　D．ice

(8)

[　　]

A．cool　　　　　　　B．warm

C．comfortable　　　　D．satisfied

(9)

[　　]

A．that　　　　　　　B．they

C．where　　　　　　D．who

(10)

[　　]

A．construct　　　　　B．continue

C．remain　　　　　　D．contain

(11)

[　　]

A．wider　　　　　　B．more

C．less　　　　　　　D．fewer

(12)

[　　]

A．on　　　　　　　B．to

C．with　　　　　　D．for

(13)

[　　]

A．a small　　　　　B．a large

C．a few　　　　　 D．many

(14)

[　　]

A．One　　　　　　B．Second

C．Next　　　　　　D．Another

(15)

[　　]

A．floating　　　　　B．flowing

C．shipping　　　　 D．blowing

(16)

[　　]

A．in　　　　　　　B．above

C．over　　　　　　D．on

(17)

[　　]

A．live　　　　　　B．be living

C．living　　　　　D．having lived

(18)

[　　]

A．Also　　　　　B．But

C．Then　　　　　D．Again

(19)

[　　]

A．in　　　　　　B．under

C．beside　　　　D．over

(20)

[　　]

A．lift　　　　　B．underground

C．plane　　　　D．bus

完形填空

　　What kind of homes will we live in in the future? (1) can be sure, but scientists are working (2) new ideas now.

　　Some scientists are (3) about building whole cities under huge glass domes(圆顶). (4) advanced heating and cooling systems will be (5) to control the weather in the domes. (6) there will never be any (7) or snow, and the temperature will always be (8) .

　　Perhaps everyone will live in vertical(垂直) cities——high rises (9) are so large that they can (10) all the necessities of life. Since vertical cities will use (11) land than flat cities, and provide homes (12) mote people, they will be practical for small countries that have (13) population.

　　 (14) idea that will be helpful to small countries is the (15) city. Monaco has already built homes, stores, and offices (16) the water of the Mediterranean Sea.

　　There are some people who think that we will go back to (17) in caves. (18) the caves of the future will be very different from the caves of the Stone Age. Farms and parks will be on the land (19) the cave city. When people want to go to the country or to a park, a short ride in a (20) will take them there.

(1)

[　　]

A．Somebody　　　　　　B．Anybody

C．Nobody　　　　　　　D．Everybody

(2)

[　　]

A．off　　　　　　　　　B．out

C．in　　　　　　　　　 D．by

(3)

[　　]

A．thinking　　　　　　　B．considering

C．imagining　　　　　　D．suggesting

(4)

[　　]

A．On the other hand　　　B．As a result

C．Of course　　　　　　  D．At the same time

(5)

[　　]

A．possible　　　　　　　B．suitable

C．pleasant　　　　　　　D．necessary

(6)

[　　]

A．Similarly　　　　　　B．Therefore

C．According to　　　　 D．Moreover

(7)

[　　]

A．cloud　　　　　　　B．rain

C．wind　　　　　　　D．ice

(8)

[　　]

A．cool　　　　　　　B．warm

C．comfortable　　　　D．satisfied

(9)

[　　]

A．that　　　　　　　B．they

C．where　　　　　　D．who

(10)

[　　]

A．construct　　　　　B．continue

C．remain　　　　　　D．contain

(11)

[　　]

A．wider　　　　　　B．more

C．less　　　　　　　D．fewer

(12)

[　　]

A．on　　　　　　　B．to

C．with　　　　　　D．for

(13)

[　　]

A．a small　　　　　B．a large

C．a few　　　　　 D．many

(14)

[　　]

A．One　　　　　　B．Second

C．Next　　　　　　D．Another

(15)

[　　]

A．floating　　　　　B．flowing

C．shipping　　　　 D．blowing

(16)

[　　]

A．in　　　　　　　B．above

C．over　　　　　　D．on

(17)

[　　]

A．live　　　　　　B．be living

C．living　　　　　D．having lived

(18)

[　　]

A．Also　　　　　B．But

C．Then　　　　　D．Again

(19)

[　　]

A．in　　　　　　B．under

C．beside　　　　D．over

(20)

[　　]

A．lift　　　　　B．underground

C．plane　　　　D．bus