题目内容

3．You are not permittedto smoke here．

分析 这里不允许你吸烟．

解答 答案是permitted．考查被动语态．句意是"这里不允许你吸烟．"用动词permit表示"允许，准许"．题干是被动语态，be动词+过去分词，所以用permit的过去分词形式permitted．故答案是permitted．

点评 本题考查首字母填空．首先要判断填写的单词及固定搭配，然后根据句意和相关语法填写正确的答案．

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13．You have two eyes and they are set close together on the front of your face．Have you wondered why？The reasons are simple and important to the way you see the rest of your world．
 Your eyes are like two small cameras．A camera catches an image of an object and records it on film．Similarly，when you look at something，each eye takes in what it sees and sends this image to the back of the eyeball．Because your eyes are set close together，they view the world from about the same height but from slightly different angles．Working as a team，the eyes send the images to your brain，which puts them together into a single，centered image．
 Seeing in stereo means seeing with two eyes working together，which is called stereoscopic sight．This allows you to view the world in three dimensions，or 3-D．Seeing depth helps you to judge the distance between you and the objects you see and to adjust to the changing angle at which you see something as you move closer to or farther away from it．If images are coming from only one eye，however，only two of these dimensions----height and width----can be perceived．A world seen with one eye is thus two-dimensional，as in a photograph．
Now consider why your two eyes are on the front of your face．Think of other animals with the same arrangement．They are all animals that hunt，like lions and wolves．Their eyes face directly in front of them．This provides a field of sight about 180 degrees wide，which is called binocular（双眼的） sight．On the other hand，animals that are hunted have eyes on the sides of the head，which provides nearly360-degree field of sight．In order to stay alive，they need to see things coming from the sides and from behind．However，without stereoscopic sight，they have difficulty determining how far a danger is．
 With sight both stereoscopic and binocular，humans share with animal hunters the ability to see from side to side and to accurately determine the distance．If you think it would be great to have another type of sight，perhaps with hundreds of tiny eyes like many insects do，think again!Each tiny insect eye sees only a tiny part．Besides，what if you needed glasses？Be glad for the eyesight that you have．
67．According to the passage，the similarity of an eye and a camera is that they bothB．
A．can imagine objects              
B．can record images
C．provide centered images          
D．work at the same height
68．Stereoscopic sight is a result of havingA．
A．two eyes close to each other that work together
B．hundreds of eyes，all seeing tiny parts of an image
C．a three-hundred-sixty-degree field of sight
D．one eye on either side of the head，each seeing a different image
69．What is the meaning of the underlined word"perceived"in Para3 most similar to？B
A．known         B．seen         C．taken            D．understood
70．We can infer from the last paragraph thatD．
A．our eyes work like cameras
B．animal hunters are glad for the sight they have
C．the three dimensions are depth，height and width
D．human beings are fortunate to have such eyesight．
14．Every electronic gadget （小玩意） needs good memory．A music player stores songs，albums and playlists．A computer holds schoolwork and programs and remembers how far a player has advanced in his or her favorite game．Mobile phones store names，numbers and hundreds of texts．
Now，scientists in California say they have come up with a way to turn a living cell into a memory device．
It can store only one tiny bit of information，but it's a start．In the future，a cell-based gadget might travel through the body and record measurements．The benefit to human health could be big：the right tool，for example，might record the earliest signs of disease．
Doctors，scientists and other curious people want to know what is happening inside the body，even at levels that can't be seen by the naked eye．So far，there is no device small enough to travel through the bloodstream．
If normal machines won't do the trick，perhaps biology will．Scientists who work in the field of synthetic （合成的） biology are trying to find ways to turn living things into human tools．In the case of the new memory device，bioengineers from Stanford University used the genetic material inside living cells to record information．
This genetic material consists of DNA．Found in nearly every cell，DNA carries all of the information that keeps a living thing alive．
In the new experiment，the researchers turned DNA from bacteria（细菌） into a switch．They"flip （翻转）"a small section of DNA．Then，using the same procedure （过程），the scientists flip the section again-returning it into its normal structure．
Using these DNA switches，"We can write and erase DNA in a living cell，"bioengineer，Jerome Bonnet，explained to Science News．
It might take years before his team or others identity whether a DNA-based memory device might be practical．Right now，it takes one hour to complete a flip．That is far too long to be useful．Plus，a flipped section has a very small little memory-less than what a computer uses to remember a single letter．
"This was an important proof that it was doable，"Bonnet told Science News．"Now we want to build a more complex system，something that other people can use．"
67．What is the aim of listing the electronic things in the first paragraph？D
A．To make the passage more fashionable．
B．To show how electronic things have memory．
C．To discuss things in detail．
D．To make the subject of the text more understandable．
68．What is possible future benefit of the cell-based gadget for people？A   A．To detect disease at the earliest point．
B．To help improve the memory．
C．To help people build a body．
D．To replace many electronic gadgets．
69．What is the object being researched？B
A．The cells of bacteria．
B．The DNA of bacteria．
C．A section of bacteria．
D．The nucleus of bacteria．
70．What do we know about a flipped section of DNA？A
A．It has a very small memory．
B．It can function as a computer．
C．It has one letter in it．
D．It takes a day to complete it．
11．For two weeks，Markaccompanied（accompany）Susan to and from work each day．
18．Andy rode slowly on his way to school，day-dreaming about the fishing trip that his father had promised him．He was so busy dreaming about all the fish he would catch that he was unaware of everything else around him．
He rode along until a strange sound drew him to the present．He came to a stop and looked curiously up to the sky．What he saw shocked and terrified him．A huge swarm of bees filled the sky like a black cloud and the buzzing mass seemed to be heading angrily towards him．
With no time to waste，Andy sped off in the opposite direction，riding furiously-but without knowing how to escape the swarm．As the bees came closer，his panic increased．Andy knew that he was sensitive to bee stings（蜇）．The last sting had landed him in hospital-and that was only one bee sting!Suddenly，his father's words came to him．"When you are in a tight situation，don't panic．Use your brain and think your way out of it．"
On a nearby hill，he could see smoke waving slowly skywards from the chimney of the Nelson family home．"Bees don't like smoke，"he thought．"They couldn't get into the house．"But Andy knew he could not reach the house in time．He estimated that the bees would catch up with him soon．
Suddenly，out of the corner of his eyes，he spotted a small dam used by Mr．Nelson．Off his bike and into the cool water he dived，disappearing below the surface and away from the savage insects．After holding his breath for as long as he could，Andy came up for air and noticed the bees had gone．Dragging himself out of the dam，he struggled up the hilly slope and rang the doorbell．Mrs．Nelson took him inside and rang his mother．

21．Why did Andy fail to notice the swarm of bees earlier？D
A．He was riding to school．
B．He was listening to a strange sound．
C．He was going fishing with his father．
D．He was lost in the thought of the fishing trip．
22．Which of the following is NOT mentioned about the swarm of bees in the passage？D
A．They crowded like a black cloud．
B．They shocked and terrified Andy．
C．They tried to attack Andy in a mass．
D．They made Andy stay in hospital for two days．
23．How did Andy avoid the bees in the end？B
A．He asked Mr．Nelson for help．
B．He hid himself under the water．
C．He rushed into the Nelson house．
D．He rode off in the opposite direction．
24．Which of the following can best describe Andy's escape from the beesD？
A．No pains，no gains．
B．Once bitten，twice shy．
C．Where there is a will，there is a way．
D．In time of danger，one's mind works fast．
8．The disease is spreadingquickly，so we must do what we can to stop it．
15．nation（　　）
A．cameraB．laborC．villageD．natura1
12．We wereshocked（shock） at the news that he should break the traffic rules．
13．A computer virus is a computer program that can copy itself and infect（传染） a computer without permission or knowledge of the user and runs against his/her wishes．All computer viruses are man-made．Here are some virus prevention tips．
Do not open any files（文件） attached to an e-mail from an unknown，or untrustworthy source．
Do not open any files attached to an e-mail unless you know what it is，even if it appears to come from a dear friend or someone you know．Some viruses can copy themselves and spread through e-mail．Better be safe than sorry and make sure that they really sent it．
Do not open any files attached to an e-mail if the subject line is questionable or unexpected．If the need to do so is there，always save the file to your hard drive before doing so．
Delete（删除） chain e-mails and junk e-mails．Do not forward（转寄）or reply to any of them．These types of e-mail are considered spam（垃圾邮件），which contains lots of annoying advertisements and useless information．
Do not download any files from strangers．Be careful when downloading files from the Internet．Ensure that the source is a legal and trustworthy one．Make sure that an anti-virus program checks the files on the download site．If you are uncertain，don't download the file at all or download the file to a floppy（软盘）and test it with your own anti-virus software．
Update your anti-virus software regularly．Over 500viruses are discovered each month，so you'll want to be protected．
Back up（备份） your files on a regular basis．If a virus destroys your files，at least you can replace them with your backup copy．You should store your backup copy in a separate location from your work files，one that is better not to be on your computer．
29．What does the passage mainly deal with？D
A．Damage caused by computer virus．
B．Viruses attached to emails．
C．Proper use of personal computers．
D．Prevention from computer viruses．
30．From the passage we can see that a computer virusD．
A．is a kind of computer operating system
B．can let you know when loading on your computer
C．sometimes can run according to our wishes
D．is a man-made computer program
31．When you download a file from an unknown source，B．
A．you'd better store it on the hardware
B．you must test it with anti-virus software
C．you shouldn't store it in the floppy
D．you must check your floppy first
32．If you want your anti-virus software to work well，you'd betterC．
A．delete chain emails and junk emails      
B．back up your files on a regular basis
C．update your anti-virus software regularly  
D．not open any files attached to an email．

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