更多"Scientists have long believed that "的相关试题:
[单项选择]Scientists have long believed that constructing memories is like playing with neurological toys. Exposed to a barrage of sensations from the outside world, we connect together brain cells to form new patterns of electrical connections that stand for images, smells, touches and sounds.
The most unshakable part of this belief is that the neurons used to build these memory circuits are depletable resource, like petroleum or gold. We are each given a finite number of cells, and the supply gets smaller each year. That is certainly how it feels as memories blur with middle age and it gets harder and harder to learn new things. Maybe it’s time for this notion to be forgotten-or at least radically revised.
In the past two years, a series of confusing experiments has forced scientific researchers to rethink this and other assumptions about how memory works. The perplexing results of these experiments remind scientists how much they have to learn about one of the last great mysteri
A. The neurons used to build the memory are a depletable resource.
B. The reason of memory loss as one grows older is that the neurons are worn out with the increase of age.
C. New memories do not need the supply of new neurons in the brain.
D. All of above.
[单项选择]
Network managers have long awaited practical voice-over-IP (VOIP)solutions. VOIP promises (71) network management and decreases costs by (72) a company’s telephony and data infrastructures into one network. And a VOIP solution implemented at a company’ s head -quarters with far -reaching branch offices can (73) tremendous amounts of (74) in long distance phone bills, provided that solution delivers POTS -like voice (75) over the Internet.
(71)处填()。
A. complicated
B. useful
C. ease
D. orderly
[单项选择]Passage Four
Public health experts have long been skeptical about the beneficial effect of pets on the health of their owners. After all, dogs bite and pass on parasites, and pigeons and parrots cause lung disease. However, in 1991, researchers at the University of Cambridge in Britain discovered that a short time after acquiring a cat or a dog, some people suffer less from health problems such as headache, backache and flu. It was also announced recently that Australians who keep pets tend to have less cholesterol in their blood than non-pet owners with comparable lifestyles, making them less likely to develop heart disease.
For the time being, the findings are little more than puzzling correlations. Why should owning a pet make you less likely to suffer from backache Why should it reduce your cholesterol level Many researchers suspect that answers will be found in the subtle links between mental and physical well-being. If the newly discovered correlations between human hea
A. animals make good pets
B. pets help spread diseases
C. pets have good effects on their owners’ health
D. happy pets rarely suffer from heart disease