短信预约职称英语考试动态提醒
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【摘要】2017年职称英语考试备考进行中，网校为帮助大家备考特分享了“2017年职称英语考试理工类补全短文练习5”，希望备考2017年职称英语考试的考生都能顺利通关，更多资料敬请关注环球职称英语考试频道！
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Watching Microcurrents Flow
We can now watch electricity as it flows through even the tiniest circuits. By scanning the magnetic field generated as electric currents flow through objects, physicists have managed ____1____. The technology will allow manufacturers to scan microchips for faults, as well as revealing microscopic defects in anything from aircraft to banknotes. Gang Xiao and Ben Schrag at Brown University in Providence, Rhode Island, visualize the current by measuring subtle changes in the magnetic field of an object and ____2__Their sensor is adapted1 from an existing piece of technology that is used to measure large magnetic fields in computer hard drives.2”We redesigned the magnetic sensor to make it capable of measuring very weak changes in magnetic fields,” says Xiao. The resulting device is capable of detecting a current as weak as 10 microamperes, even when the wire is buried deep within a chip, and it shows up features as small as 40 nanometers across. At present, engineers looking for defects in a chip have to peel off the layers and examine the circuits visually; this is one of the obstacles ____3____. But the new magnetic microscope is sensitive enough to look inside chips and reveal faults such as short circuits , nicks in the wires or electro migration — where a dense area of current picks up surrounding atoms and moves them along. “It is like watching a river flow,” explains Xiao. As well as scanning tiny circuits, the microscope can be used to reveal the internal structure of any object capable of conducting electricity.3 For example, it could look directly at microscopic cracks in an aeroplane’s fuselage, ____4____. The technique cannot yet pick up electrical activity in the human brain because the current there is too small, but Xiao doesn’t rule it out4 in the future. “I can never say never,” he says. Although the researchers have only just made the technical details of the microscope public, it is already on sale,5 from electronics company Micro Magnetics in Fall River, Massachusetts. It is currently the size of a refrigerator and takes several minutes to scan a circuit, but Xiao and Schrag are working ____5____.
A to shrink it to the size of a desktop computer and cut the scanning
B to making chips any smaller
C to take tiny chips we require
D to picture the progress of the currents
E converting the information into a color picture showing the density
F faults in the metal strip of a forged banknote or bacteria in a water
参考答案： DEBFA
环球网校友情提示：2017年职称英语考试即将开始报名，本文整理“2017年职称英语考试理工类补全短文练习5”供考生参考练习。如果您在此过程中遇到任何疑问，请登录环球网校职称英语频道及职称英语论坛，我们随时与广大考生朋友们一起交流!
【摘要】2017年职称英语考试备考进行中，网校为帮助大家备考特分享了“2017年职称英语考试理工类补全短文练习5”，希望备考2017年职称英语考试的考生都能顺利通关，更多资料敬请关注环球职称英语考试频道！
The Bilingual Brain
When Karl Kim immigrated to the United States from Korea s a teenager, he had a hard time learning English. Now he speaks it fluently, and he had a unique opportunity to see how our brains adapt to a second language. As a graduate student, Kim worked in the lab of Joy Hirsch, a neuroscientist in New York. __1 They found evidence that children and adults don't use the same parts of the brain when they learn a second language.
The researchers used an instrument called an MRI( magnetic resonance imaging) scanner to study the brains of two groups of bilingual people. __2 . The other consisted of people who, like Kim, learned their second language later in life. People from both groups were placed inside the MRI scanner. This allowed Kim and Hirsch to see which parts of the brain were getting more blood and were more active. They asked people from both groups to think about what they had done the day before, first in one language and then the other. They couldn't speak out loud because any movement would disrupt the scanning.Kim and Hirsch looked specifically at two language centers in the brain - Broca's area~ , which is believed to control speech production, and Wernicke's area, which is thought to process meaning. Kim and Hirsch found that both groups of people used the same part of Wernicke's area no matter what language they were speaking. 3__ People who learned a second language as children used the same region in Broca's area for both their first and second languages. People who learned a second language later in life used a different part of Broca's area for their second language. __4 Hirsch believes that when language is first being programmed in young children, their brains may mix the sounds and structures of all languages in the same area. Once that programming is complete, the processing of a new language must be taken over by a different part of the brain.A second possibility is simply that we may acquire languages differently as children than we do as adults. Hirsch thinks that mothers teach a baby to speak by using different methods involving touch, sound, and sight. 5__.
A But their use of Broca's area was different.
B One group consisted of those who had learned a second language as children.
C How does Hirsch explain this difference?
D We use special parts of the brain for language learning.
E And that is very different from learning a language in a high school or college class.
F Their work led to an important discovery.
参考答案： FBACE
环球网校友情提示：2017年职称英语考试即将开始报名，本文整理“2017年职称英语考试理工类补全短文练习5”供考生参考练习。如果您在此过程中遇到任何疑问，请登录环球网校职称英语频道及职称英语论坛，我们随时与广大考生朋友们一起交流!