题目内容
The phrase "scale down" in Paragraph 3 probably means to __________.
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下面的()是确定投资者是否有权领取本次股利的日期。
根据以下材料，回答题
Biorobotics
Surgeons are being able to enter the eye to carry out operations——atleast in a virtual sense.
Techniques derived from virtual reality- the computer system that immerses operations in an artificial computer-generatedworld —— will allow surgeons to feel as if he could see the inside of， the eyeduring an operation， creating the illusion that they are actually there.
Researchers at the Biorobotics （生物机械人技术） Laboratory of McGill University in Montreal are building a robot， known as Micro SurgeryRobot-1 （MSR-I for short） ， that will perform. delicate operations under thecontrol of a human surgeon. The robot is specifically designed for performing eye surgery but could have other applications， such as the removal ofbrain tumors.
The system could also be used to allow surgeons and theirstudents to practice simulated surgery that feel like the real thing —— withoutthe real consequences for the patients.
During the operations， the surgeon manipulates a set of controls knownas the master. These are connected through a high-performance computer tothe robot. Both the master and the robot have two limbs. When the surgeonmoves the master"s limbs， the robot"s limbs move in exactly the same way， except that the movements can be sealed down as much as a thousandtimes. This will eliminate hand tremor and poor accuracy and thus reducethe damage to the eye that can occur with present microsurgery techniques.Each of the robot"s limbs has a minimum movement of one micrometer——more than one hundred times the precision of the human hand.
The computer also creates a three-dimensional robot"s eye view of theinside of the eye that the surgeon can see by wearing a virtual reality helmet （头盔） that has a small lens in front of each eye.
To provide the surgeon with such a realistic experience， MSR-I must beable to move rapidly，but this requires extremely fast computing. To handlethe computational demands of instant interaction， the McGill team is constructing its own parallel-processing computer. It is also studying areas such asmuscle mechanism， artificial intelligence and optics， and has already built another microrobot， MR-I， capable of manipulating a single living cell.
The so-called "virtual reality" mentioned in this passage refers to __________. 查看材料
根据以下材料，回答题
American Society
When foreigners are sometimes asked what seems most strange about American society，somewhere on the top of the list will be the fact the average citizen is allowed to possess guns.
Although it is true that many people carry guns legally in the United States， it is also known that many who possess guns carry illegally. Others， who don"t have guns， feel that guns can be acquired quite easily. A recent survey indicated that many high school students， especially in the inner cities， can acquire gun with little difficulty.
Although most people would never want to own a gun， others have taken up hunting as a sport and enjoy hunting wild game in season. Hunting for deer and duck in fall and winter is very much a part of the American culture.
Also， some farmers in rural areas who raise cattle and sheep feel they need to protect their animals against wolves that attack their herds and flocks at night. To defend and support their rights to possess firearms the National Rifle Association （NRA） was founded in 1871. The main importance of this organization has been its efforts to prevent strict gun control legislation. The NRA has great political support in small towns and rural areas， especially in the West and the South，where hunting is especially popular. Those who favor the right to possess guns insist that the Constitution provides the right of people "to keep and bear arms". They believe that gun control laws will not solve the problem of crime and violence in America.
Recent events in America， however， have shown that the question of gun possession is now out of control and strong voices have called for immediate action to be taken. In seemingly peaceful schools students have gone into classrooms and opened fire upon their classmates.
America has been shocked by such incidents which seem to occur with greater frequency. The periodic deaths of innocent citizens and even foreign visitors from guns have forced legislators to pass laws to stop these senseless killings.
The day may not be far off when America will be transformed from a gun culture to one which controls their use and possession.
What is most unusual about American society？ 查看材料
Paragraph 3 ___________ 查看材料
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