题目内容
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Some scientists believe that hibernation is started by ______.
A．over-eating
B．calcium deposits
C．a body chemical
D．a lack of water
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更多“Some scientists believe that h…”相关的问题
Some scientists believe that hibernation is started by______.
A．a lack of food
B．calcium deposits
C．a body chemical
D．a lack of water
Some years ago safety rules_________．
A.were put forwardDue to scientists’recommendations
B.came into being as a result of the workers’demand
C.were introduced because quite a number of people were kiHed or seriously in-jured
D.were effective enough to protect workers and customers
Some years ago safety rules ______.
A．were put forward due to scientists' recommendations
B．came into being as a result of the workers' demand
C．were introduced because quite a number of people were killed or seriously injured
D．were effective enough to protect workers and customers
Some years ago safety rules ______. ()
A．were put forward due to scientists' recommendations
B．came into being as a result of the workers' demand
C．were introduced because quite a number of people were killed or seriously injured
D．were effective enough to protect workers and customers
Why did the scientists at the University of California make the experiment？
A．To help children in hospital recover from their illness.
B．To look for the evidence of laughter's power in women patients.
C．To test the effect of laughter on children who were seriously ill.
D．To see whether laughter could replace some active exercises.
【C1】
A．have used
B．have been used
C．has been used
D．will be used
Many Native Americans closely resemble Asians. 正确his has led most scientists to(1)believe something about Native Americans. 正确hey think that most Native Americans(2)from a distant group of people. 正确hese people(3)from Siberia across the Bering Strait, between 17,000-11,000 years ago. 正确he exact time and 4 is still under question. 正确hat is, it is still a(n)(5)of debate. 正确he time they traveled and the route they took is still being argued, as is whether it happened(6).
(7)recently, some anthropologists (人类学家) argued that the migration occurred 12,000 years ago. However, there are a number of difficulties with this theory —(8)particular, the presence of people in the Americas earlier than one might think. 正确here is growing evidence of human(9)in Brazil and Chile 11,500 years ago or earlier. 正确here is also(10)of humans living in the Americas some 50,000 years ago.(11), other possibilities have been suggested.
正确hey may have(12)the land bridge several thousand years earlier or they may have sailed along the western coast. However, some(13)this theory. 正确hey think that humans(14)skills for sailing during that era.
Some consider the genetic and cultural evidence for an Asian origin overwhelming. It should be noted,(15), that some other people are very upset at this idea. Many present-day Native Americans(16)the above theories. 正确hey say those who put forward such theories have political(17)正确hey have their own traditional stories that offer(18)of where they came from. 正确heir own stories claim that their(19)are different from what scientists say. 正确hose accounts, though, have mostly been(20)by scholars. 正确herefore, the origin of Americans still remains a mystery to be explored.
21. Now many animals can do some simple jobs that are done by human beings.
22. The writer says that 8t a circus we can see animals doing cIever tricks.
23. The trainer usually gives the animal a piece of candy or fruit after it has done the trick.
24. The reward in the passage means "attention paid to a good behavior".
25. Many animals may be trained to do simple jobs if they know who their trainers are.
26. Geese can be used to guard a house.
27. When the pigeon sees a ball which looks different from the others , it makes a noise.
28. Trainer usually spends 40 days or so training a pigeon to inspect sm811 steel balls.
29. An ape is a large monkey.
30. Scientists believe apes may drive buses one day.
Some of the computer experiments now going on inspire exciting visions of the future. For example, scientists are working on devices that can electronically perform. some sight and hearing functions, which could make life easier for the blind and deaf. They're also working on artificial arms and legs that respond to the electric impulses produced by the human brain. Scientists hope that some day a person who's lost an arm could still have near-normal brain control over an artificial arm.
Video games, computerized special effects in movies, and real-life training machines now being used by the US Army are causing some people to predict new educational uses for computers. Computers could some day be used to simulate travel to other planets, to explore the ocean floor, or to look inside an atom.
Experiments with electronic banking and shopping inspire predictions that these activities will soon be done from home computer terminals. Cars, too, might be equipped with computers to help drivers find their way around (Honda has one in an experimental car) or to communicate with home and office computers. Many people, including handicapped workers with limited ability to move around, already are working at home using computer terminals. Each terminal is connected to a system at a company's main office. Some futurists say the day may come when few people will have to leave home to go to work -- they'll just turn on a terminal
A growing number of factories such as the General Motors Plant in Newark, Delaware, "hire" computerized robots to perform. tasks such as spot welding. Some executives get a gleam in their eyes as they envision the spread of these "perfect workers" -- no coffee breaks, no strikes, and no vacations or sick days.
These modern and potential computer uses are possible because of the silicon microchip.
These chips, which have become increasingly complex since their beginning in 1959, contain a network of information pathways. Electronic impulses travel along the paths. The plans for a chip look much like a city street plan and can be as large as a football field. It can take as long as three months to complete a new chip design. Chips are used to store information, too. An entire "computer" can be put onto one chip -- called a microprocessor.
As chips become even more complex, easier to make, and less costly, futurists predict limitless possibilities. A group of Japanese scientists is working on a new generation of computers, which they hope will be able to understand vocal instructions, talk back to their users, and automatically try out alternate solutions to a problem to come up with the best answer.
Some people say that the humans of the future will never be without their companion -- computers. Predicting the future can be tricky, of course. In 1948 an IBM study predicted that there would never be enough demand for computers to justify going into the business!
What is the purpose of the passage？
A．To tell the readers what computers will look like in the future.
B．To show the close relations between man and computers.
C．To tell the readers how important silicon microchips are.
D．To talk about the possible future uses of computers.
