冲击系数的变化范围是（）。A、1≤kim≤1.7B、1≤kim≤1.8C、1≤kim≤1.9D、1≤kim≤2

共用题干
The Bilingual Brain
When Karl Kim immigrated to the United States from Korea as 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 Their work led to an important discovery.They found evidence that children and adults don't use the same parts ofthe 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.One group consisted of those who had learned a second language as children.The other consisted of people who,like Kim,learned their second language later in lite.Peoplefrom both groups were placed inside the MRI scanner ,This allowed Kim and Hirsch to see which parts of thebrain were getting more blood and were more active.They asked people from both groups to think about whatthey had done the day before ,first in one language and then the other.They couldn't speak out loudbecause any movement would disrupt（干扰）the scanning.
Kim and Hirsch looked specifically at two language centers in the brain-Broca' s area, which isbelieved to control speech production,and Wernicke's area,which is thought to process meaning.Kim andHirsch found that both groups of people used the same part of Wernicke's area no matter what language theywere speaking.But their use of Broca's area was different.
People who learned a second language as children used the same region in Broca's area for both tneir 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.How does Hirsch explain this difference?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 adifferent part of the brain.
A second possibility is simply that we may acquire languages differently as children than we do asadults.Hirsch thinks that mothers teach a baby to speak by using different methods involving touch,sound and sight.And that is very different from learning a language in a high school or college class.

Kim and Hirsch find that children______.
A: use the same region in Broca's area to learn their first and second language
B:learn a second language slower than adults
C:are better at acquiring the sound system of a second language than adults
D:use special parts of the brain to program the structures of their first language

如图所示，各元件参数标于图中，取基准功率为SB=100MVA，当线路末端f点发生三相短路时，短路点的短路冲击电流iim和最大有效值电流Iim分别为（　　）。（短路冲击系数取kim=1.8）

A． 6.68kA，3.95kA
B． 5.47kA，3.36kA
C． 7.25kA，4.30kA
D． 8.98kA，5.62kA

Questions 182-184 refer to the following e—mail

Barry，
Thanks again for arranging that videoconference last week．I just heard from Maxine Dawson，our account manager for the Johnson Company account，that the next product trial will be September 8 in their production plant in Denver．She has requested that I fly out there with her．of course，I still plan to attend the Engineering Society awards dinner in San Francisco on September9，SoI’ve booked a flight there after the meeting．Let me know when you’11 be arriving there．1’m looking forward to seeing you honored in San Francisco．You deserve it!
Regards，
Andrew Kim
Celgar Associates
Who is Maxine Dawson?

A.An employee at Celgar Associates
B.A manager at Johnson Company
C.A travel agent for Mr．Kim
D.A presenter at an award ceremony

共用题干
The Bilingual Brain When Karl Kim immigrated to the United States from Korea as 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.______(46)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.______(47)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. ______(48) 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.______(49)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.______(50)

______(46)
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.

共用题干
The Bilingual Brain
When Karl Kim immigrated to the United States from Korea as 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 Their work led to an important discovery.They found evidence that children and adults don't use the same parts ofthe 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.One group consisted of those who had learned a second language as children.The other consisted of people who,like Kim,learned their second language later in lite.Peoplefrom both groups were placed inside the MRI scanner ,This allowed Kim and Hirsch to see which parts of thebrain were getting more blood and were more active.They asked people from both groups to think about whatthey had done the day before ,first in one language and then the other.They couldn't speak out loudbecause any movement would disrupt（干扰）the scanning.
Kim and Hirsch looked specifically at two language centers in the brain-Broca' s area, which isbelieved to control speech production,and Wernicke's area,which is thought to process meaning.Kim andHirsch found that both groups of people used the same part of Wernicke's area no matter what language theywere speaking.But their use of Broca's area was different.
People who learned a second language as children used the same region in Broca's area for both tneir 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.How does Hirsch explain this difference?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 adifferent part of the brain.
A second possibility is simply that we may acquire languages differently as children than we do asadults.Hirsch thinks that mothers teach a baby to speak by using different methods involving touch,sound and sight.And that is very different from learning a language in a high school or college class.

It can be inferred from the last paragraph that______.
A:students do better in high school than in college
B:bilingual children will learn better in college classes
C:mothers are good language teachers
D:it takes more time for adults to learn a second language

Question 61-63 refer to the following email.
To: Barry Weinstein （bweinstein@celgar.com）
From: Andrew Kim （akim@celgar.com）
Subject: Next month
Date: August 3
Barry,
Thanks again for arranging that videoconference last week. I just heard form Maxine Dawson, our account manager for the Johnson Company account, that the next product trial will be September 8 in their production plant in Denver. She has requested that I fly D. A presenter at an award ceremony.
out there with her. Of course, I still plan to attend the Engineering Society awards dinner in San Francisco on September 9, so I've booked a flight there after the meeting. Let me know when
you‘ll be arriving there.
I'm looking forward to seeing you honored in San Francisco. You deserve it!
Regards,
Andrew Kim
Celgar Associates

Who is Maxine Dawson?

A. An employee at Celgar Associates.
B. A manager at Johnson Company.
C. A travel agent for Mr.Kim.
D. A presenter at an award ceremony.

冲击系数kim的数值变化范围是（ ）。

A.0≤kim≤1
B.1≤kim≤2
C.0≤kim≤2
D.1≤kim≤3