AnnealingAnnealing is a way of making metal softer by heating it and then lettin
题型：不详难度：来源：
Annealing
Annealing is a way of making metal softer by heating it and then letting it cool very slowly, if metal is heated and then cooled very quickly, for example by dipping(浸) it in water, it will be very hard but also very brittle(脆)—that is, it will break easily. Metal that has been annealed is soft but does not breaks as easily. It is possible to make metal as hard or as soft as is wished, by annealing it. The metal is heated, and allowed to cool slowly for a certain length of time. The longer the heated metal takes to cool slowly, the softer it becomes. Annealing can also be used on other material, such as glass.
1. Annealing can make metal ____
A. hard and tough(韧) B. hard but brittle C. soft but tough D. soft and brittle
2. Why do people put hot metal in water?
A. To make it hard. B. To make it soft. C. To make it cool. D. To make it brittle
3. In annealing, the required hardness of a metal depends on ______
A. the quantity of water used B. the temperature of the metal
C. the softness of the metal D. the timing of the operation
4. As suggested by the text, how can glass be made less brittle?
A. It can be heated and then cooled quickly.
B. It can be cooled and then heated slowly.
C. It can be heated and then cooled slowly.
D. It can be cooled and then heated quickly.
答案
1---4 CADC
解析
2.本题属推断归纳题。文中第一句：”if metal is heated and then cooled very quickly, for example by dipping it in water, it will be very hard but also very brittle”.意思是说如果把金属加热，然后迅速放到水里冷却，也就会变得非常硬，但也变得脆。“bald”是工艺的主观目的。“brittle”是伴随的客观结果。因此选A而不选D,B项与题目不符:C项是手段不是目的。因此，都可被排除。A为正确答案。
3.此题属概括归纳题。timing是时间的选择。本答案的依据是5和6两句，“The metal is heated，… length of time．”“The longer…the softer it becomes．”，“。cool”的时间是可以控制的，时间越长就越“soft”，即硬度就越低。由此我们可得出结论：在退火过程中，金属的硬度是受到冷却的时间长短影响的。文章中没有提到退火时使用的水的数量，没有提到金属的温度，也没有提及金属的软度。因此这三答案均被排除。D为正确答案。
4.此题属推理判断题。文中最后一句说“Annealing can also be used on other materials ,such as glass.”很明显退火这工艺同样可用于象玻璃一类的其他材料。文中我们已知“annealing”就是先“heat”后“。cool slowly”．由此推断C是正确的。A项中“Cooled quickly”不符合上述工艺要求。B和C工艺程序都不对。因此，A、B、D三项被排除。C为正确答案.
举一反三
“We tend to describe climate change in terms that are abstract—a one degree rise in temperature, an increase in greenhouse gases—but when waves wash away a village, that’s concrete and very emotional,” says Igor Krupnik, an expert at the National Museum of Natural History. “When they lose a piece of their land, they aren’t just losing a certain number of square miles. They are losing part of their history and their memory. They are losing childhood events and grandparents’ tales.”
Before temperatures began to rise in Shishmaref about 30 years ago, 20 to 30 miles of hard sea ice protected the village from powerful fall storms. But the natives say the ice doesn’t freeze as solidly or as soon as it used to and now stretches only six or seven miles, leaving the community of 600 people more exposed. Storms have swept houses into the ocean.
The villagers’ plan is to move to Tin Creek, a site on the Alaska mainland 12 miles away, and they have received $180 million from the government. Residents hope that in their new community they’ll be able to maintain their close ties, continue hunting animals, and keep fishing, much as their ancestors have done for centuries. “People are asking why the government should be spending so much money on so few people,” said a government official. “But people in Alaska are like everyone else. We want to help keep their culture alive.”
小题1:The underlined word “buffered” probably means “______”.
| A．protected | B．destroyed | C．prevented | D．damaged |
| A．It was very thin and easily broken. |
| B．It was very thick and smooth. |
| C．It frozen more solidly and sooner. |
| D．It frozen more slowly and solidly. |
| A．water pollution | B．global warming |
| C．air pollution | D．human’s actions |
| A．To live more happily | B．To earn money |
| C．To avoid being washed away | D．To keep their culture alive |
On May 21, 2000, some American scientists were working at the computers to look for information they needed . Suddenly they saw a lot of very bright red spots crossing the computers’ screens. At the same time the computers were working much slower. To find out what was happening they stopped their work to check some parts of the computers. To their horror, they found out that most of their stored information was got rid of by computer viruses (病毒). Obviously all these computers had been infected by computer viruses.
It is said that the computer viruses were made by two or three Philippine young men fond of playing tricks. They all had excellent education. They created the viruses just to show their intelligence. The kind of computer virus is named I Love You Virus. This virus can hide in computers for long. When the time comes they will attack the computers by lowering the important functions, damaging their normal programs or even getting rid of a great deal of information which operators of the computers often use or store, what’s worse, it still can reproduce itself in great quantities within a short time.
We come to know that “I Love You” Virus often attacks computers on Mondays and that it is spreading to many computers in the world. Among the countries that suffered computer viruses last year are Britain, Australia, Switzerland and the USA. Those who made the computer muses have been found out slowly and carefully. But till now, how to get rid of the terrible viruses remains a problem.
1.When the viruses attack the computers, the computers will work _______.
A. normally B. abnormally C. faster D. well
2 .Two or three Philippine young men created the computer viruses to _______.
A. damage the computers
B. test their ability quickly
C. tell the world that they were intelligent
D. play a trick in operators of the computers
3. According to the passage, computer viruses seem to________.
A. have been in nature for years
B. exist in any computers
C. be able to be got rid of in the near future
D. be difficult to get rid of at present
4.The most serious damage caused by the viruses is that_______.
A. the computer’s funtions are lowered
B. the normal programs are damaged
C. all the information stored in the computers is gone
D. the computers infected by the viruses can no longer be used
5. According to the passage, which of the following is true?
A. Scientists are trying to find a way to get rid of the viruses.
B. The viruses will come to the new computer after staying in the old one for some time.
C. Last year four countries found their computers were infected by viruses.
D. The “I Love You” Virus is a great harm to human health.
In Renee Smith"s classroom, attendance is up, trips to the headmaster"s office are down and students are handing in assignments on time. The Springfield High School teacher says she has seen great ___11___ since adding a few new students to her class – five Labrador puppies and their father.
The seven ___12___ students in Smith"s class have a history of discipline ___13___. But since they"ve started teaching the dogs obedience (顺从), their own ___14___ has improved. A dog trainer Chuck Reynolds ___15___ the students a new trick each week that they then work on with the puppies. At night, the dogs go home with the staff members who have raised them. They get dropped off in the morning, ___16___ a parent would take a child to day care.
Smith said she came up with the idea when her dog had puppies and she saw how ___17___ her own children responded to them. She consulted with school psychologist Kristin Edinger, ___18___ they took the idea-- along with letters from students ___19___the programme -- to the school board. A pet therapist said, "What you are trying to teach is ___20___ and that there are consequences for the decisions you make."
11. A. promotion B. progress C. disturbance D. disappointment
12. A. human B. dog C. new D. Labrador
13. A. problems B. questions C. issues D. troubles
14. A. habit B. attitude C. action D. behaviour
15. A. guides B. teaches C. permits D. aids
16. A. such as B. much as C. so that D. even if
17. A. well B. quickly C. poorly D. carelessly
18. A. but B. so C. and D. because
19. A. revising B. describing C. opposing D. supporting
20. A. self-criticism B. self-respect
C. self-control D. self-importance
At the beginning of this century, medical scientists made an interesting discovery; we are built not just of flesh and blood but also of time. They were 36 to show that we all have “a body clock” 37 us, which controls the 38 and fall of our body energies, 39 us different from one day one to the next.
The 40 of “a body clock” should not be too 41 since the lives of most living things are controlled 42 the 24 hour night-and-day cycle. We feel 43 and fall asleep at night and become 44 and energetic during the day. If the 24 hour-cycle is 45 , most people experience unpleasant 46 . For example, people who are not 47 to working at night can find that 48 of sleep causes them to 49 badly at work.
50 the daily cycle of sleeping and 51 , we also have other cycles which 52 longer than one day. Most of us would 53 that we feel good on some days and not so good on 54 ; sometimes our ideas seem to flow and at other times, they 55 do not exist.
36．A．anxious B．able C．careful D．proud
37．A．inside B．around C．between D．on
38．A．movement B．supply C．use D．rise
39．A．showing B．treating C．making D．changing
40．A．invention B．opinion C．story D．idea
41．A．difficult B．exciting C．surprising D．interesting
42．A．from B．by C．over D．during
43．A．dull B．tired C．dreamy D．peaceful
44．A．regular B．excited C．lively D．clear
45．A．disturbed B．shortened C．reset D．troubled
46．A．moments B．feelings C．senses D．effects
47．A．prevented B．allowed C．expected D．used
48．A．miss B．none C．lack D．need
49．A．perform B．show C．manage D．control
50．A．With B．As well as C．Except D．Rather than
51．A．working B．moving C．living D．waking
52．A．repeat B．remain C．last D．happen
53．A．agree B．believe C．realize D．allow
54．A．other B．the other C．all other D．others
55．A．just B．only C．still D．yet
The Ministry of Education has spared no efforts to bring on IT learning. What is its main aim? Is it to teach students how to learn the computer or is it meant to change the usual method of teaching in order to 1 students’ strong interest in computers?
Teaching students computer knowledge and skills is different 2 giving class lessons through the use of computers. And schools are beginning to pay much attention to using computers to teach students. There is 3 about the fact that IT learning plays an important role as a new teaching tool in this day of technology. 4 ,views differ on whether the schools can achieve their targets, as success 5 whether they can make use of computers effectively.
Let’s take the subject of Chinese as an example and see 6 difficulties the experts face in their IT management. At present,20 percent of lessons are given with the help of computers. In other words, in a period of 10 weeks, a Chinese-language teacher must spend two weeks to teach the subject 7 .In carrying out such a major policy as IT learning, the experts should know the 8 that different teachers teaching different subjects have different demands, thus making it 9 to see the policy through.
Some teachers, having already got some computer knowledge, will still be forced to 10 the training courses with those who have zero knowledge about computer.
Another problem is that new teachers may be sent to work in schools 11 IT learning has just started. All teachers—including the seniors who are very 12 in teaching, but who suddenly have no idea what to do when it comes to computers will have to 13 from the very beginning. They will become 14 and their teaching performances may be badly affected. The experts have found out how much of each subject is taught by computers in every school, and have 15 all schools to complete the given work. A hard-pressed teacher may put the daily teaching 16 or the courses onto the computer just to order the required time for IT learning and then 17 the usual way. Furthermore, he may leave school work to his 18 through the computer before class comes to an end in order to “complete” his IT learning 19 . 20 the teaching of the Chinese language is concerned, do computer lessons really achieve the desire goals to raise the students’ level of Chinese, pass on common values and so on? I am not so sure.
1.A.show B.be C.match D.have
2.A.with B.to C.in D.from
3.A.no reason B.no doubt C.no need D.no time
4.A.However B.Therefore C.And D.So
5.A.depends on B.leads to C.results in D.believes in
6.A.that B.such C.what D.how
7.A.the usual way B.the regular way C.the best way D.the new way
8.A.fact B.message C.news D.truth
9.A.easy B.helpful C.hard D.fast
10.A.sit for B.run for C.give D.attend
11.A.for which B.that C.where D.which
12.A.interested B.satisfied C.successful D.experienced
13.A.work B.start C.teach D.manage
14.A.pleased B.disappointed C.certain D.comfortable
15.A.ordered B.improved C.encouraged D.instructed
16.A.methods B.skills C.programs D.performances
17.A.make a living B.give lessons C.go to lectures D.does work
18.A.work-mates B.headmasters C.instructors D.students
19.A.skills B.experiences C.duties D.methods
20.A.As B.So long as C.Even though D.As far as
最新试题
- 我国淡水面积大约为66000千米2，用科学记数法表示为（ ）千米2。
- 听对话，根据所听内容填写下面的身份证卡片。FIRST NAME:__1__ LAST NAME:__2__ TELEPH
- 2009年底，希腊债务问题爆发，引发欧元危机，欧洲急剧动荡，欧盟前途扑朔迷离。探究欧洲的历史，回答下列问题。【文明起源】
- 2008年我州旅游收入达52644.85万元，比2007年增长了40.7%．用科学记数法表示2008年我州的旅游收入是_
- 青春期内，男性和女性会出现的新生理现象是（ ）A．遗精和月经B．第二性征和肺活量变化C．心输出量增加D．身高增加，体重
- 如图，在下面直角坐标系中，已知A（0，2），B（3，0），C（3，4）三点，（1）求三角形ABC的面积；（2）如果在第二
- My name ____ Jack. Liu Ying and Sun Mei ____ my friends.[
- 某成年男子身高90厘米，智力正常，可能是患A．侏儒症B．糖尿病C．甲亢D．呆小症
- 除去下列物质中的少量杂质（括号内为杂质）所用方法正确的是（ ）A．ZnSO4溶液（CuSO4）﹣﹣加入过量的锌粉，充分反
- 用“王水”（浓盐酸与浓硝酸的混合物）溶解黄金后得到四氯合金酸（HAuCl4），其中金元素（Au）的化合价为 A．+3
热门考点
- 某市为了鼓励居民节约用水，采用分段计费的方法按月计算每户家庭的水费，月用水量不超过20时，按2元／计费；月用水量超过20
- 小明做实验时不小心沾了一些KMnO4，皮肤上的黑斑很久才能消除，如果用草酸的稀溶液洗涤马上可以复原，其离子方程式为：Mn
- 通过溶解、过滤、蒸发等操作，可将下列各组混合物分离的是[ ]A．硝酸钠、氢氧化钠 B．氧化铜、二氧化锰 C．
- 育种工作者在研究番茄染色体变异时，用秋水仙素处理基因型为Aa的番茄幼苗，所获得的番茄植株是____倍体，基因型为____
- 小东发现野营篝火的火焰很小，于是将木柴架空了一些，他这样做主要是为了[ ]A. 使木柴与空气充分接触B. 升高木
- 某些花岗岩石材中含有放射性元素氡，已知一个氡原子的质量为a g,一个碳-12原子的实际质量为b g,则氡原子的相对原子质
- 函数的单调增区间为 ；
- — The key may be in your bag.— .A．So does itB．So is itC．
- 下列句子没有语病的一句是[ ]A．江山代有才人出，这位年轻建筑师的出色工作和独特设计，已被有关单位采用并受到国外
- 下列家庭常用物质中，属于纯净物的是（ ）A．牛奶B．酱油C．蔗糖D．葡萄酒
© 2017-2019 超级试练试题库,All Rights Reserved.