单项选择题
A．It hurts our eyes.
B．It hurts our skin.
C．It is harmful to our respiratory system.
D．It can cause cancers.
- A.It
B.
B．It
C.
C．It
D.
D．It
E.
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单项选择题
New research from Vanderbilt University suggests that we can remember more faces than other objects and that faces 'stick' the best in our short-term memory. The reason may be that our expertise in remembering faces allows us to package them better for memory. 'Our results show that we can store more faces than other objects in our visual short-term memory,' Gauthier, associate professor of psychology and the study's co-author, said. 'We believe this happens because of the special way in which faces are encoded.' Kim Curby, the study's primary author and a post-doctoral researcher at Yale University, likens such encoding to packing a suitcase. 'How much you can fit in a bag depends on how well you pack it,' she said. 'In the same way, our expertise in 'packaging' faces means that we can remember more of them.' Curby and Gauthier's research has practical implications for the way we use visual short-term memory or VSTM. 'Being able to store more faces in VSTM may be very useful in complex social situations,' Gauthier said. 'This opens up the possibility of training people to develop similarly superior VSTM for other categories of objects,' Curby added. Short-term memory is crucial to our impression of a continuous world, serving as temporary storage for information that we are currently using. For example, in order to understand this sentence, your short-term memory will remember the words in the beginning while you read through to the end. VSTM is a component of short-term memory that helps us process and briefly remember images and objects, rather than words and sounds. VSTM allows us to remember objects for a few seconds, but its capacity is limited. Curby and Gauthier's new research focuses on whether we can store more faces than other objects in VSTM, and the possible mechanisms underlying this advantage. Study participants studied up to five faces on a screen for varying lengths of time (up to four seconds). A single face was later presented and participants decided if this was a face that was part of the original display. For a comparison, the process was repeated with other objects, like watches or cars. Curby and Gauthier found that when participants studied the displays for only a brief amount of time (half a second), they could store fewer faces than objects in VSTM. They believe this is because faces are more complex than watches or cars and require more time to be encoded. Surprisingly, when participants were given more time to encode the images (four seconds), an advantage for faces over objects emerged. The researchers believe that our experience with faces explains this advantage. This theory is supported by the fact that the advantage was only obtained for faces encoded in the upright orientation, with which we are most familiar. Faces that were encoded upside-down showed no advantage over other objects.We can remember more faces than other objects in our VSTM because______.A．we have better knowledge for storing facesB．faces last longer in our memoryC．we package faces better for memoryD．faces are encoded in a special way in our mind
A.
B.'
C.'
D.
E.
F.
G.
H.
I.
J.
We
K.
A．we
L.faces
M.we
N.faces -
单项选择题
上交所A股上证180指数成分股的折算率不超过70%。( )
A.正确
B．错误 -
单项选择题
How the Smallpox War Was Won The world's last known case of smallpox was reported in Somalia, the Horn of Africa, in October 1977. The victim was a young cook called Ali Maow Maalin. His case becomes a landmark in medical history, for smallpox is the first communicable disease ever to be eradicated. The remarkable campaign to free the world of smallpox has been led by the World Health Organization. The Horn of Africa, embracing the Ogaden region of Ethiopia and Somalia, was one of the last few smallpox ridden areas of the world when the WHO—sponsored Smallpox Eradication Programme (SEP)got underway there in 1971. Many of the 25 million inhabitants, mostly farmers and nomads living in a wilderness of desert, bush and mountains, already had smallpox. The problem of tracing the disease in such formidable country was exacerbated further by the continuous warfare in the area. The program concentrated on an imaginative policy of 'search and containment.' Vaccination was used to reduce the widespread incidence of the disease, but the success of the campaign depended on the work of volunteers. These were men, paid by the day, who walked hundreds of miles in search of 'rumours”—information about possible smallpox cases. Often these rumours turned out to be cases of measles, chicken pox or syphilis but nothing could be left to chance. As the campaign progressed the disease was gradually brought under control. By September 1976 the SEP made its first report that no new cases had been reported. But that first optimism was short-lived. A three-year-old girl called Amina Salat, from a dusty village in the Ogaden in the south-cast of Ethiopia, had given smallpox to a young nomad visitor. Leaving the village the nomad had walked across the border into Somalia. Therc he infected 3,000 people, and among them had been the cook, Ali. It was a further 14 months before the elusive 'target zero'—no further cases--was reached. Even now, the search continues in 'high risk' areas and in parts of the country un- checked for some time. The flow of romours has now diminished to a trickle--but each must still be checked by a qualified person. Victory is in sight, but two years must pass since the last case before an International Commission can declare that the world is entirely free from smallpox.Ali Maow Maalin's case is significant because he was the______.A．last person to be cured of smallpox in SomaliaB．last known sufferer of smallpox in the worldC．first smallpox victim in the Horn of AfricaD．first Somalian to be vaccinated for smallpox
A.
B.
C.
D.'
E.
F.
G.
H.
Ali
I.
A．last
J.last
K.first
L.first
