进程间用信件来交换信息时必须要有send和teceive两条基本的通信原语，它们的功能是（）

A:可调用send原语请求把信件发送给指定的进程或指定的信箱 B:可调用teceive原语请求从指定的进程或指定的信箱中索取一封信件 C:若指定的信箱已存满了信件，则把调用send原语的进程置成等信箱状态 D:若指定的信箱中无信，则把调用teceive原语的进程置于等信件状态 E:当把一封信存入了信箱或从信箱中取出一封信后应释放等信件者或等信箱者

Many children do not go to school either because their parents want them at home as carers for siblings, or simply because their parents cannot be bothered to send them. Thousands more are not registered at any school at all, because of their families’ unstable lives.
Underlying this dreadful situation there are two central truths. First of all, the problem of children not going to school often has more to do with their parents than with the children themselves. Secondly, once children go to school, we need to make sure that the experience is a positive one so that they want to keep on going.
In Britain, the Ministry of Education has introduced a complex package of sticks and carrots to persuade schools to bring truants (children who do not go to school when they should) and excluded children back into the classroom. It is paying grants so that a thousand schools can set up special units to help these children. Schools receive the grant if they bring a target number of children back to school; if they do not meet the target, the grant is withdrawn. Parents are the subject of this campaign, too: the Home Office has introduced fines for parents who fail to send their children to school, and has given the police power to pick up truants on the streets.

The Home Office （　）

A:will punish parents who fail to send their children to school B:will give money to parents to send children to school C:has given powers to the police to pick up parents D:persuaded children not to escape from school

It was very (considerable) (of) you (to send) me the information so (promptly),

A:considerable B:lf C:send D:promptly

Roman soldiers in some places built long rows of signal towers. When they had a message to send, the soldiers shouted it from tower to tower. If there were enough towers and enough soldiers with loud voices, important news could be sent quickly over distance.
In Africa, people learned to send messages by beating on a series of large drums (鼓). Each drum was kept within hearing distance of the next one. The drum beats were sent out in a special way that all the drummers understood. Though the messages were simple, they could be sent at great speed for hundreds of miles.
In the eighteenth century, a French engineer found a new way to send short messages. In this way, a person held a flag in each hand and the arms were moved to various positions representing different letters of the alphabet (字母表). It was like spelling out words with flags and arms.
Over a long period of time, people sent messages by all these different ways. However, not until the telephone was invented in America in the nineteenth century could people send speech sounds over a great distance in just a few seconds.
We can infer from this passage that______.

A:people cannot sent visible information until 19th century B:we cannot communicate without sound C:the ways of communication are similar in different countries D:in ancient time, enough people is necessary to send messages over distance

Small robots designed by University of Nebraska researchers may allow doctors on Earth to help perform surgery on patients in space.
The tiny, wheeled robots, (1) are about 3 inches tall and as wide as a lipstick case, can be slipped into small incisions (切口) and computer-controlled by surgeons in different locations. Some robots are equipped (2) cameras and lights and can send images back to surgeons and others have surgical tools attached that can be (3) remotely.
"We think this is going to (4) open surgery," Dr. Dmitry Oleynikov said at a news conference. Oleynikov is a (5) in computer-assisted surgery at the University of Nebraska Medical Center in Omaha.
Officials hope that NASA will teach (6) to use the robots soon enough so that surgeries could one day be performed in space.
On earth, the surgeons could control the robots themselves (7) other locations. For example, the robots could enable surgeons in other places to (8) on injured soldiers on the front line. Researchers plan to seek federal regulatory (9) early next year. Tests on animals have been successful, and tests on humans in England will begin very soon.
The camera-carrying robots can provide (10) of affected areas and the ones with surgical tools will be able to maneuver (操控) inside the body in ways surgeons’ hands can’t. The views from the camera-carrying robots are (11) than the naked eye, because they (12) back color images that are magnified (放大). Because several robots can be inserted through one incision, they could reduce the amount and (13) of cuts needed for surgery, which would decrease recovery time. This is particularly (14) to those patients who have been debilitated (使虚弱) by long illness.
Eventually, Oleynikov said, the tiny robots may enable surgeons to work without ever (15) their hands in patients’ bodies. "That’s the goal," Oleynikov said. "It’s getting easier and easier. We can do even more with these devices. /

A:send B:produce C:change D:create

Citizen Scientists 　　Understanding how nature responds to climate change will require monitoring key life cycle events — flowering, the appearance of leaves, the first frog calls of the spring — all around the world. But ecologists can’t be(51) so they’re turning to non-scientists, sometimes called citizen scientists, for help. 　　Climate scientists are not present everywhere.(52) there are so many places in the world and not enough scientists to observe all of them, they’re asking for your help in(53) signs of climate change across the world. The citizen scientist movement encourages(54) people to observe a very specific research interest — birds, trees, flowers budding, etc. — and send their observations(55) a giant database to be observed by professional scientists. This helps a small number of scientists track a(56) amount of data that they would never be able to gather on their own.(57) like citizen journalists helping large publications cover a hyper-local beat, citizen scientists are ready for the conditions where they live.(58) that’s needed to become one is a few minutes each day or each week to gather data and (59) it in. 　　A　group of scientists and educators launched an organization last year(60) the National Phenology(生物气候学) Network. "Phenology" is what scientists call the study of the timing of events in nature. 　　One of the group’s first efforts relies on scientists and non-scientists (61)to collect data about plant flowering and leafing every year. The program, called Project Bud Burst, collects life cycle(62) on a variety of common plants from across the United States. People participating in the project — which is (63) to everyone — record their observations on the Project Bud Burst website. 　　"People don’t (64) to be plant experts — they just have to look around and see what’s in their neighborhood," says Jennifer Schwartz, an education consultant with the project. "As we collect this data, we’ll be able to make an estimate of (65) plants and communities of plants and animals will respond as the climate changes."

A:send B:print C:answer D:keep

下面的短文有15处空白，请根据短文内容为每处空白确定1个最佳选项。

A:send B:produce C:change D:create

　Robots May Allow Surgery in Space 　　Small robots designed by University of Nebraska researchers may allow doctors on Earth to help perform surgery on patients in space. 　　The tiny,wheeled robots,（51）are about 3 inches tall and as wide as a lipstick case,can be slipped into small incisions(切口)and computer-controlled by surgeons in different locations.Some robots are equipped（52）cameras and lights and can send images back to surgeons and others have surgical tools attached that can be（53）remotely. 　　“We think this is going to （54）open surgery,”Dr Dmitry Oleynikov said at a news conference.Oleynikov is a （55）in computer-assisted surgery at the University of Nebraska Medical Center in Omaha. 　　Officials hope that NASA will teach（56）to use the robots soon enough so that surgeries could one day be performed in space. 　　On earth,the surgeons could control the robots themselves（57）other locations.For example,the robots could enable surgeons in other places to （58）on injured soldiers on the front line.Researchers plan tp seek federal regulatory（59）early nest year.Tests on animals have been successful,and tests on humans in England will begin very soon. 　　The camera-carrying robots can provide（60）of affected areas and the ones with surgical tools will be able to maneuver(操控)inside the body in ways surgeons’ hands can’t.The views from the camera-carrying robots are （61）than the naked eye,because they（62）back color images that are magnified(放大).Because several robots can be inserted through one incision,they could reduce the amount and （63）of cuts needed for surgery,which would decrease recovery time.This is particularly（64）to those patients who have been debilitated(使虚弱)by long illness. 　　Eventually,Oleynikov said,the tiny robots may enable surgeons to work without ever（65）their hands in patients’ bodies.“That’s the goal,”Oleynikov said.“It’s getting easier and easier.We can do even more with these devices.”

A:send B:produce C:change D:create