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 traces of memory are made in an area called hippocampus.
B. The hippocampus stores long-term memory.
C. The hippocampus is located behind the forehead.
D. The information is stored in only the hippocampus, not in cerebral cortex.
[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
[单项选择]Sociologists have long recognized that social tensions are elements of group life.（ ）
A. average
B. routine
C. normal
D. standard
[简答题]Scientists have long assumed that most of the ice that melted was in the Northern hemisphere (半球) during the 30,000-year long ice age.
[单项选择]Earth’s Inner Core
Scientists have long struggled to understand what lies at the planet’s center, Direct
observation of its center is impossible，so researchers must_____(51)to other evidence．
In 1889，a German scientist detected a severe earthquake in Japan．Geophysicists concluded that shock waves_____(52)jolts(晃动)from one side of Earth through the center to the other side．Then in 1936，Danish geophysicist Inge Lehmann studied the waves______(53) to determine that within Earth’s core of molten(熔化了的)iron lies a solid inner core-but_____ (54)that core was made of eluded(难倒)her．Other geophysicists quickly determined that Lehmann’s inner core was composed mostly_____(55)iron. Since then，Lehmann’s discovery has_____(56)conventional Earth science．
But now scientists are challenging traditional theory with new and radical _____(57) For example，Earth’s center could actually contain an“inner core within the inner core，claim Ishii and colleague Adam Dziewonski．Analyzing hundreds of thousan
A. adical
B. traditional
C. classical
D. conventional
