题目
题型：不详难度：来源：
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．
小题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
小题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 |
| 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 |
| A．Cloud Seeding |
| B．Artificial Raining |
| C．Weather Changing |
| D．Cloud Gathering |
| A．three | B．two | C．one | D．four |
答案
小题1:B
小题2:C
小题3:D
小题4:A
小题5:B
解析
试题分析：文章介绍了催化云的方法的发明和云催化的两种方法（干冰和碘化银），还有具体的过程。
小题1:细节题：从文章第二段的句子：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 本打算处理飞机机翼上的冰。选B
小题2:细节题：从文章第三段的句子：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过程是：f．将干冰射入云层，e．将小的雨滴变成晶体b．晶体吸引更多的水， d．晶体变得更重，c．晶体以水的形式落下，a．在温暖的天气下雪变成雨，选C
小题3:细节题：从文章第四段的句子：He used particles of silver iodide because its crystal structure resembled that of ice in clouds．可知Bernard用碘化银催化云的方法因为它们很相似，选D
小题4:标题确定题：从文章的内容和第一段的句子：Cloud seeding is a method of artificially causing clouds to produce precipitation （降水） in the form of rain or snow．可知这篇文章讲的是云的催化。选A
小题5:细节题：从文章第三段和第四段的内容：可知提到两种催化云（干冰和碘化银）的方法，选B
核心考点
试题【Cloud seeding is a method of artificially causing clouds to produce precipitatio】；主要考察你对题材分类等知识点的理解。[详细]
举一反三
The number of hospitalizations for heart disease and stroke went down significantly among a certain group of people at a certain time of year. What folks, and what time of year, you ask? Flu season and the lucky people were the ones who got flu shots(流感疫苗).
It’s generally recommended that people over fifty get their flu shots every year. Influenza(流行性感冒) is no small thing. it’s responsible for around thirty six thousand deaths a year in the U. S. alone. Getting the shots also cuts down on the chances of getting pneumonia(肺炎), which is especially dangerous in seniors.
But what wasn’t known was that there seems to be an added benefit to getting a flu shots in terms of warding off heart problems. The data,in fact, are quite strong in suggesting this is the case.
In this study, flu shots cut clown the number of hospitalizations for heart disease by nineteen percent. Stroke went down sixteen percent one season and a whopping twenty-three percent a second season.These are big results.
So what"s the connection between getting a flu shot and having a stronger heart? It isn’t yet known.
Researchers speculate that the flu virus itself may do damage to blood vessels(血管), possibly making clots(血块)more likely. Blood clots in the heart can cause heart attacks, and blood clots in the brain can cause strokes.
Whatever the specific details are, there"s one more good reason to follow your doctor’ s advice and get that annual flu shot.
小题1:According to the study, the number of hospitalizations for heart disease and stroke went down significanntly among the ones who _____.
| A．got flu shots after they were ill |
| B．got flu shots before they were ill |
| C．got flu shots at the flu season |
| D．got flu shots whenever convenient |
| A．it can cut down on the chances of gettingpneumonia |
| B．it can cut down the number of hospitalizations for heart disease |
| C．it can kill the flu virus |
| D．if can make blood clots |
| A．keeping away | B．dealing with | C．setting off | D． picking up |
| A．work out to fight against influenza | B．get flu shot every year |
| C．follow our doctor"s all advice | D．protect our blood vessels |
An estimated 80 percent of American adults think music lessons improve children"s abilily to learn or their performance in school. They say that the satisfaction for learning to play a new song helps a child express creativity.
Researchers at Harvard University, however, have found that there"s one thing musical training does not do. They say it does not make children more intelligent. Samuel Mehr is a graduate student at Harvard"s School of Education. He said it is wrong to think that learning to play a musical instrument improves a child"s intellectual development. He says the evidence comes from studies that measured the mental ability of two groups of 4-year-olds and their parents. One group attended music class, the other went to a class that places importance on the visual arts—arts that can be seen.
"The evidence there is "no". We found no evidence for any advantage on any of these tests for the kids participating in these music clases," said Mehr.Samuel Mehr says researchers have carried out many studies in an effort to learn whether musical training can make children smarter. He says the results have been mixed. He says only one study seems to show a small percentage increase in IQ, intellectual scores among students after one year of music lessons. He does not believe that IQ is a good measure of child"s intelligence. He says researchers in his study compared how well children in the musical training group did on mental processing tasks or projects, then the results were compared to those of children who did not take lessons. There was no evidence that the musical training group did much better on the mental tasks than the other group.
The researchers comfirmed the results with a larger group of children and their parents.Mr Mehr says music lessons may not offer children a fast easy way to gain entry to the best schools later of their life. But he says the training is still important for cultural reasons. In his words, "We teach music because music is important for us."
小题1:According to the new study, musical training______.
| A．makes children smarter |
| B．helps a child express creativity |
| C．does not make children more intelligent |
| D．improve children"s ability to learn in school |
| A．the children who attended music class are smarter than those who attended arts class |
| B．IQ is a good measure of a child"s intelligence |
| C．we needn"t to teach children music |
| D．music training is still important for cultural reasons |
| A．conducted more than one research |
| B．interviewed many American adults |
| C．taught two groups of 4-yetr-olds music and arts |
| D．offered children a fast way to be admitted to the best schools |
| A．health | B．education | C．culture | D．economy |
A California company — BrightSource Energy is building a huge solar power plant in the Mojave desert, about 60 kilometers southwest of Las Vegas, Nevada. The plant is known as the Ivanpah Solar Electric Generating System. Joe Desmond works for the company. "This is actually one of the highest concentrations of sunlight in the world, out here in Ivanpah." explained Desmond. BrightSource Energy will deploy 170,000 specially designed mirrors to direct solar energy towards boilers on top of three power towers. The steam produced in the boilers will drive turbine (涡轮) to make electricity. Joe Desmond says the steam can reach temperatures of more than 260 degrees Celsius. "We can store the sun"s thermal energy in the form of molten salt, so we can produce electricity even when the sun goes down. There is a lot of interest in concentrating solar power around the globe in environmnents where you have lots of sun, such as China, South Africa, the Middle East, North Africa, explained Desmond.
Environmentalists generally support the idea of solar power, however, many are concerned about the effect of power plants on sensitive environment. Lisa Belenky is a lawyer with the Center for Biological Diversity, a private group. She says environmentalists are specifically worried about the effect of the Ivanpah Solar Project on the sensitive plant and animal life in that part of Mojave desert. "Even though the desert seems big, when you start cutting it up, it can really affect how the species and the animals and the plants are able to survive in the long run,"said Lisa Belenky. BrightSource Energy has already spent more than $ 50 million to move endangered desert tortoises away from the power plant. but Lisa Belenky says this is not the answer. "We should be reusing areas that have a1ready been disturbed, like old mining sites, for example...either on homes, on businesses, parking lots." said Belenky.
There have also been reports of birds dying at the Ivanpah Plant and others like it.
Some birds die after colliding with solar equipment which the animals mistake for water. Other birds were killed or suffered burns after flying through the intense heat at the solar thermal plant. As solar projects increase, environmentalists and developers are considering what to do to reduce bird death.
小题1:Why is the Ivanpah Solar Electric Generating System being built in the desert?
| A．Because the temperature is extremely high in the desert. |
| B．Because there is no life in the desert. |
| C．Because there is much salt in the desert. |
| D．Because sunlight is highly focused in the desert. |
| A．Because the sun"s thermal energy can be stored in the form of steam. |
| B．Because the sun"s thermal energy can be stored in the form of molten salt. |
| C．Because the sun"ss thermal energy can be stored through mirrors |
| D．Because the sun"s thermal energy can be stored in the boilers. |
A. we should move all the plants and animals away from the solar plant
B. we should guide the bird not to hit the solar plant
C we should build the solar plant in disturbed areas
D. we should build the solar plant in the desert
小题4:The author’s attitude towards the solar projects is _____.
| A．supportive | B．critical | C．indifferent | D．cautious |
Here are a few tips to kelp you remain calm in the face of the storm:
• Don"t Panic You are better able to find a solution if you aren"t panicking. If you can keep your head when others are losing theirs, you will be able to make a dear decision in the chaos.
• There Aren"t Many True Emergenaes My time as a Naval Officer taught me about true emergencies. In the military, when there is a problem, people can get hurt or die. This is not usually the case when the office copier or email server goes down. Keep things in perspective. There are very few true emergencies in life.
• Avoid the "Fight or Flight" When you are stressed, your body will want to go into "fight or flight." Your body was designed to keep you safe from danger, but its natural reflexes aren"t always the best solution against a project gone away. Keep your emotions in check and ensure that your physical reflexes don’t make bad decisions for you.
• Head Into The Problem While everyone else is running away, true leaders walk into a problem. Sticking your head in the sand only makes things worse. Instead of trying to ignore the situition, get to the heart of the issue as soon as possible. Only then can you address it
How Will You React? When you find yourself ready to lose it, take a step back. Ask, "In this truly an emergcncy?" Keep your head when others are losing theirs. And you"ll find that you are that much closer to a solution.
小题1:The author writes the first paragraph in order to______.
| A．describe a chaotic day | B．advocate a way of life | C．introduce a topic | D．make a joke |
| A．low your head | B．keep your head | C．shake your head | D．stick your head |
| A．there are seldom true emergencies in life |
| B．there are many true emergencies in life |
| C．some emergencies are really urgent |
| D．some emergencies can"t be predicted |
| A．Fight or Flight |
| B．True emergencies |
| C．Less Talking, More Doing |
| D．Keep calm in the face of the storm |
On the first day of class, the teacher faces a room filled with individuals. Perhaps a few closely united groups and friendships already exist. But there is no sense of group unity, no set of rules for conduct in the group, no feeling of belonging. If teachers are successful leaders, they will help students develop a system of relationships that encourages working together.
Standards and rules must be set to keep order, make sure of justice and protect individual rights, but do not contradict school policy. What happens when one student hurts another’s individual rights? Without clear regulations agreeable to the students and teachers, the classroom can become chaotic. Students may break rules they did not know existed. If standards are set without participation from the class, students may spend a great deal of creative energy in destroying the class environment or finding ways to break rules.
No matter how skillful the teacher is in uniting students and creating a positive atmosphere, the task is never complete. Regular maintenance is necessary. Conflicts arise. The needs of individual members change. A new kind of learning task requires a new organizational structure. Sometimes outside pressures such as holidays, upcoming tests or sport competitions, or family troubles cause stress in the classroom. One task for the teacher is to recreate a positive environment by helping students deal with conflict, change, and stress.
小题1:The underlined word “maintain” in Para.1 probably means_______.
| A．keep | B． build | C．recreate | D．evaluate |
| A．free students from outside pressures |
| B．set the standards and rules on his own |
| C．be responsible for a well-organized class |
| D．focus more on instruction and evaluation |
| A．rules cannot be changed once they’re formed |
| B．outside pressures can not cause tension among students |
| C．if the teacher well unites his students, he then will finish his task |
| D．if rules are not acceptable both to students and teachers, the classroom can be a mess |
| A．To provide information for teaching. |
| B．To show the importance of teaching a class. |
| C．To study the teacher’s behavior in the classroom. |
| D．To compare the teacher’s behavior with the students’ in class. |
最新试题
- 1书面表达： Life is just like a mirror（镜子） , you smile at it , and
- 2下列港口城市与附近流经河流组合正确的是（ ）A．重庆---嘉陵江B．宜宾---乌江C．南京-----汉江D．武汉---
- 3一般垃圾的处理措施有__________、__________和___________。
- 4填表：
- 5化简AC-BD+CD-AB得（ ）A．ABB．DAC．BCD．0
- 6常用于制造电线、电缆的金属是（ ）A．铁B．铜C．锌D．镁
- 7计算：(3)2=（ ）A．3B．9C．6D．23
- 8为了解某校九年级学生每天的睡眠时间情况，随机调查了该校九年级10名学生，将所得数据整理并制成下表： 据此估计该校九年级学
- 9Do you hope to go _______? [ ]A. warm somewhere B. anywh
- 10酒精的热值是3.0×107J/kg，表示的物理意义是______．一杯酒精倒出一半，剩下酒精的热值______（选填“变
热门考点
- 1现代遗传学认为，控制生物性状的遗传物质的功能单位和结构单位是：[ ]A．蛋白质B．核糖体C．DNAD．基因
- 2请在横线部分写出正确的化学方程式或离子方程式（每题2分，共12分）（1）镁在二氧化碳中燃烧
- 3已知点P(x，y+1)在第二象限，则点Q(－x+2，2y+3)在第______象限．
- 4平分生命 ①男孩与他的妹妹相依为命。父母早逝，他是她惟一的亲人。所以男孩爱妹妹胜过爱自己。 ②然而灾难再一次降临
- 5如图为肾单位结构模式图，分别从其不同的部位抽取样品甲、乙、丙三种液体进行化验，结果如下表．请分析回答下列问题：主要成分甲
- 6小明将微风电风扇与小灯泡按如图所示的电路连接并进行实验，用手快速拨动风扇叶片，这时发现小灯泡发光，微风电风扇居然变成了“
- 7甲车以72千米/小时的速度作匀速直线运动．在它正前方120米处有一辆乙车也在作匀速直线运动．如果甲车驶出240米后恰好追
- 8下列四个铁路枢纽中，图序和排序相符合的是[ ]A．①包头②上海③成都④重庆B．①银川②南京③武汉④重庆C．①包头
- 9【题文】函数f(x)＝是( )A．偶函数，在(0，＋∞)是增
- 10如图所示，质量为m的由绝缘材料制成的球与质量为M＝19m的金属球并排悬挂。现将绝缘球拉至与竖直方向成θ＝60°的位置自由