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This reports shows something of home computer use by a group of young people. It is a common idea that children today know about computers and have a good knowledge of using them in all sides of their lives. We decided to try to find out whether this was true.
We asked thirty young people between 14 and 18. All the children said they had computers at home. We asked them how much time they usually spent on their computers in a week, but we were most interested in what they used their computers for.
The usual time spent on a computer in a week was about 12 hours, with the highest user about 32 hours and the lowest user only 5 hours. There was no great difference between boys and girls.
All the children said they usually used the computer to play games. Fourteen told us they did some wordprocessing(文字处理) at home, but not very much. Only 2 of them said that computers helped them with their studies, and 8 people told us they kept addresses and telephone numbers on their computers or used them as diaries. Only 3 people said they were learning to make computer programmes, and nobody looked up databases(数据库) (other than their address lists). None of the people used their computers for any other use. The diagram(图表) gives all the results one by one.
The results show that computer use is quite high among 14-18 year-old children. They also show quite clearly that computers are seen by most young people as little more than games machines. The only other great uses are for wordprocessing and keeping address lists. It seems to us that, though computers are common in the homes of young people, they have not yet become useful in everyday life.
1.In the diagram, what does the letter “d” show?
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A.3 people between 14 and 18.
B.Only 2 of the group.
C.To help them with their studies.
D.To help them with computer programmes.
2.We are afraid there is one mistake in the diagram What is it?
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A.the words “Number of people” and “Computer use” should be changed each other.
B.Add all the numbers from “a” to “g”, the number should just be 30.
C.The number of “d” should be higher.
D.There should be not number about “f”.
3.In the report, “little more than” means ________.
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4.If children could use computers usefully, that means ________.
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A.children could play all kinds of different games
B.more other databases than address lists should be learnt
C.there would be great different between boys and girls
D.computers would be much more popular
查看习题详情和答案>>We asked thirty children between 14 and 1 8.A11 the children had computers at home.The usual time spent on computer in a week was about 1 2 hours, with the highest
user about 3 2 hours.and the lowest user only 5 hours.
A11 the children said they usually used computers to play games.Fourteen children told us thev did some word processing(文字处理)at times.Only two of them said computers helped them with their lessons.and eight children told us they kept addresses and phone numbers on their computers or used them as diaries.Only three children said they were learning to make computer programs and nobody looked up databases(数据厍).The diagram gives all the results one by one.The results show that computer use is quite high among 14 to 18-year—old children.They also show quite clearly that computers are looked on by most young people as little more than game machines.It means that,though computers are common in the homes of young people,they have not yet become popular in everyday 1ife.
( )1.In the diagram,what does the letter ‘‘d’’ show?
A.It shows three people between 14 and 18.
B.It shows only two of the thirty children.
C.It shows that only two of them use computers to help them with their lessons.
D.It shows that only three of them use computers to help them make computer programs.
( )2.Most of the 3 0 children spent about hours on computers in a week.
A.5 B.1 2 C.20 D.32
( ) 3.There iS one mistake in the diagram.What is it?
A.The number of “e" should be lower.
B.The number of ‘‘d’’ should be higher.
C.The.number of “a” is too high.
D.There should be no number about “f’’.
( )4.In the last paragraph “little more than” means .
A.almost the same as B.far more than C.different from D.much more than
( )5.The writer thinks .
A.children must learn to play a11 kinds of games
B.more other uses of computers should be learned
C.young people should spend more time on computers
D.computers will become much cheaper
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We asked thirty young people ____2____ fourteen and eighteern.We asked them ____3____ they usually spent on their computers in a week,but we were ____4____ in what they used the computers ____5____.
The usual time spent on a computer in a week was about twelve hours,with ____6____ user about thirty-two hours, and the lowest user about five hours.
All the children said they usually used computers ____7____ .Fourteen children told us they did some word-processing(文字处理) ____8____ .Only two of them said computer ____9____ their lessons,and eight people told us they kept addresses and phone numbers ____10____.Only three people said they were learing to make computer programmes and nobody looked up databases(数据库).None of them used computers for any other use.
The ____11____ show that computers ____12____ by most young people as ____13____ than game machines.The only other great uses are for word-processing and keeping address lists.____14____ ,though computers are common in the homes of young people,they have not yet become ____15____ in everyday life.
1. ( )A.used by B.given to C.made for D.bought by
2. ( )A.among B.between C.for D.about
3. ( )A.how long away B how much moneyC.how much time D.how often
4. ( )A.busy B.better C.careless D.interested
5. ( )A.for B.on C.about D.to
6. ( )A.high B.higher C.the higher D.the highest
7. ( )A.to read B.to show C.to play games D.to manage house
8. ( )A.at times B.as usual C.at last D.in no time
9. ( )A.encouraged B.expressed C.served D.attracted
10. ( )A.in their minds B.on their computersC.in their note-booksD.in their desk notes
11. ( )A.problems B.results C.sceneries D.informations
12. ( )A.regard B.have regarded C.will regard D.are regarded
13. ( )A.a little more B.a little C.more D.a bit
14. ( )A.More or less B.From then on C.By the way D.It seems to us that
15. ( )A.wonderful B.popular C.useful D.expensive
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完形填空
Look at the diagram. It 1 something of home computers used by a group of young people.
We asked thirty young people 2 fourteen and eighteen. We asked them how much 3 they usually spent on their computers in a week, but we 4 most interested in 5 user about thirty-two hours, or only five hours. The usual time spent on a computer in a week was about twelve hours, with 6 user about thirty-two hours, and the lowest user only five ours.
All the children said they usually used computers 7 . Fourteen children told us that they did some wordprocessing(文字处理) 8 . Only two of them said computers 9 their lessons, and eight people told us they kept addresses and phone numbers on their computers or used 10 as diaries. Only three people said they were learning to make computer programmes and nobody looked up databases(数据库). None of them used computers for any 11 use.
The 12 show that computer use is quite high among 14-18 years old. They also show quite clearly that computers 13 by most young people as little more than game machines. The only other great uses are for word-processing and keeping address lists. 14 , though computers are common in the homes of young people, they have not yet become 15 in everyday life.
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实验一:将空白琼脂和含EDTA的琼脂做成帽状,分别套在甲、乙两组玉米胚根的根冠外(示意图如下)。提示:EDTA的作用是去除与其临接部位的 Ca2+。
将胚根水平放置培养一定时间后,观察到甲组胚根向重力(下)生长,乙组胚根水平生长。根据上述实验结果,得出实验结论: 。
实验二:水平放置的胚根弯曲向下生长,与根冠近地侧的Ca2+浓度明显高于远地侧有关。研究表明,根总是朝着Ca 2+浓度高的方向弯曲生长。为验证这一结论,有人设计了下列实验方案。请根据提供的实验材料和用具,写出第二步及以后的实验步骤和实验结果,并回答问题。
(1)实验材料和用具:胚根等长的萌发玉米种子,空白琼脂帽,含EDTA的琼脂帽,上面部分含Ca2+的琼脂帽(水平方向),培养皿等。
(2)实验步骤:
第一步:取若干个培养皿,在每个培养皿中放置适量的萌发玉米种子,按实验一中乙组的方法处理胚根一定时间后,移去根冠外的琼脂帽。然后将培养皿平均分成两组,编号为 A组、B 组。
第二步: 。
第三步: 。
(3)实验结果: 。
(4)科学家进一步证实,根冠中生长素的分布受Ca2+浓度影响,当胚根水平放置时,重力诱导Ca2+向根冠下侧移动,导致近地侧的生长素浓度比远地侧高。请分析胚根的生长素分布与向重力生长的关系: 。 查看习题详情和答案>>