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 （有爭議的）．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 （碘化銀）．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．
小題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
小題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(chǎn)-c-f-d-b-eB．b-f-e-a-c-d
C．f-e-b-d-c-aD．e-a-d-c-b-f
小題3:Bernard chose silver iodide as a method of cloud seeding because___．
A．it is much cheaper than dry iceB．it can be stored at any rooms
C．it can be sent into clouds by windD．it is similar
小題4:The best title for the passage may be "____"．
A．Cloud Seeding
B．Artificial Raining
C．Weather Changing
D．Cloud Gathering
小題5:How many methods of cloud seeding are mentioned in the passage?
A．three B．twoC．oneD．four

小題1:B
小題2:C
小題3:D
小題4:A
小題5:B

試題分析：文章介紹了催化云的方法的發(fā)明和云催化的兩種方法（干冰和碘化銀），還有具體的過程。
小題1:細(xì)節(jié)題：從文章第二段的句子：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,可知Langmuir和 Schaefer 本打算處理飛機機翼上的冰。選B
小題2:細(xì)節(jié)題：從文章第三段的句子：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．
可知用干冰催化的云的過程是：f．將干冰射入云層，e．將小的雨滴變成晶體b．晶體吸引更多的水， d．晶體變得更重，c．晶體以水的形式落下，a．在溫暖的天氣下雪變成雨，選C
小題3:細(xì)節(jié)題：從文章第四段的句子：He used particles of silver iodide because its crystal structure resembled that of ice in clouds．可知Bernard用碘化銀催化云的方法因為它們很相似，選D
小題4:標(biāo)題確定題：從文章的內(nèi)容和第一段的句子：Cloud seeding is a method of artificially causing clouds to produce precipitation （降水） in the form of rain or snow．可知這篇文章講的是云的催化。選A
小題5:細(xì)節(jié)題：從文章第三段和第四段的內(nèi)容：可知提到兩種催化云（干冰和碘化銀）的方法，選B
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