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[单选题]
naive T cell是（）
A.已初次接触过Ag的不成熟T细胞
B.未接触过Ag的成熟T细胞
C.已初次接触过Ag的成熟T细胞
D.未接触过Ag的末成熟T细胞
E.尚未离开胸腺的T细胞
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题目内容
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题目内容
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A.已初次接触过Ag的不成熟T细胞
B.未接触过Ag的成熟T细胞
C.已初次接触过Ag的成熟T细胞
D.未接触过Ag的末成熟T细胞
E.尚未离开胸腺的T细胞
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更多“naive T cell是（）”相关的问题
Why do some people oppose stem cell research according to the man？
A．They don't know about the benefits of the research.
B．The research goes against their religious beliefs.
C．The research costs too much money.
D．They insist that the research is against nature.
W: You don't say, I can't believe it.
Q: What might be the price of the new cell phone？
(14)
A．$50.
B．$100.
C．$250.
D．$150.
听力原文：M：The cell phone is a bit small，isn't it？
W：All the cell phones I've ever seen are like that．That's the in thing these days．
Q：What does the woman imply？
(13)
A．Cell phones are more convenient when they are smaller.
B．He should change his thinking and understand that smaller phones are better.
C．He should accept the fashion.
D．Cell phones are not worth buying these days.
What do we learn about a stem cell？
A．It has no difference from other cells.
B．It can only become a certain type of cell.
C．It can't become a kidney cell.
D．It maintains and repairs the body.
A.He didn"t like cell phones at all and thought they were poisonous， especially，for kids.
B.He believed that cell phones were ruining kids" abilities to experience their own lives.
C.He worried that his kids would play their phones in class and be absent-minded.
D.He was a different kind of father who would like to raise his kids in a different way.
A recent【C3】______by market research company Synovate showed that 70 percent of 1,000 respondents【C4】______the poorest etiquette in cell phone users over other devices. The worst habit？ Loud phone conversations in public places, or "cell yell,"【C5】______to 72 percent of the Americans polled.
"People use【C6】______anywhere and everywhere," Ervin said. "At the movies-turn【C7】______your cell phone. I don't want to pay $10 to be sitting next to some guy chitchatting to his girlfriend【C8】______his cell phone. " This rudeness has deteriorated public spaces, according to Lew Friedland, a communication professor【C9】______the University of Wisconsin-Madison. He【C10】______the lack of manners a kind of unconscious rudeness,【C11】______many people are not【C12】______of what they're doing or the others around them.
"I think it's really noticeable in any plane, train or bus【C13】______you're subjected against your will【C14】______someone else's conversation," he said. "You can listen to intimate details of their uncle's illness, problems with their lovers and【C15】______they're having for sinner. " "It【C16】______what. was a public" common space and starts to【C17】______it up into small private space. "
A short time ago, if cell phone users【C18】______politely asked to talk quietly, they would【C19】______with chagrin, he said. "Now more and more people are essentially treating you like you don't understand that loud cell phone use is【C20】______in public."
【C1】
听力原文： Students sitting the National College Entrance Exam are likely to see cell phone signals blocked inside exam sites this year to prevent cheating.
While education authorities said they would use modern technology to tighten management of exam sites, the new regulation didn't bother the majority of local exam takers. The new regulation, which was issued by the Ministry of Education, suggested cities—especially those with a track record of cheating scandals—quip exam sites with cell phone signal shielding facilities. It means handsets won't work even if students have their phones on during the exam.
"The city will follow the Ministry of Education's instruction," said Wang Xin, a publicity official with the Shanghai Education Commission. "But exam site management details have yet to be worked out. Previously, students were only asked to switch off cell phones. However, people could switch their phones to vibration mode."
In June, 18 students in Guizhou Province were disqualified from the exam after they attempted to Seek help from teachers by sending exam questions via short message. A popular measure that exam organizers take is to install a microelectronic wave detector. An alarm sounds if a cell phone is found working in the classroom. Officials said it is impractical to simply ban handsets from exam rooms as students can hide them in many places or use other devices.
(1)
A．To increase the number of exam supervisors.
B．To ban handsets from exam rooms.
C．To equip exam sites with cell phone signal shielding facilities.
D．To impose severe punishment on cheating students.
The word "naive" in "a naive picture of the scene" most likely means
A．uneducated.
B．immature.
C．pure and reliable.
D．informal.
请根据短文的内容，回答题。
Sugar Power for Cell Phones
Using enzymes commonly found in living cells, a new type of fuel cell produces small amounts of electricity from sugar. If the technology is able to succeed in mass production, you may some day share your sweet drinks with your cell phone.＜br＞
In fuel cells, chemical reactions generate electrical currents. The process usually relies on precious metals, such as platinum. In living cells, enzymes perform. a similar job, breaking down sugars to obtain electrons and produce energy.＜br＞
When researchers previously used enzymes in fuel cells, they had trouble keeping them active,says Shelley D. Minteer of St LouisUniversity. Whereas biological cells continually produce fresh enzymes, there&39;s no mechanism in fuel cells to replace enzymes as they quickly degrade.＜br＞
Minteer and Tamara Klotzbach, also of St LouisUniversity, have now developed polymers that wrap around an enzyme and preserve it in a microscopic pocket. "We tailor these pockets to provide the ideal microenvironment for the enzyme," Minteer says. The polymers keep the enzyme active for months instead of days.＜br＞
In the new fuel cell, tiny polymer bags of enzyme are embedded in a membrane that coats one of the electrodes. When glucose from a sugary liquid gets into a pocket, the enzyme oxidizes it, releasing electrons and protons. The electrons cross the membrane and enter a wire through which they travel to the other electrode, where they react with oxygen in the atmosphere to produce water. The flow of electrons through the wire constitutes an electrical current that can generate power.＜br＞
So far, the new fuel cells don&39;t produce much power, but the fact that they work at all is exciting, says Paul Kenis, a chemical engineer at the University of Illinois at Urhana-Champaign.＜br＞
"Just getting it to work," Kenis says, "is a major accomplishment."＜br＞
Sugar-eating fuel cells could be an efficient way to make electricity. Sugar is easy to find. And the new fuel cells that run on it are biodegradable, so the technology wouldn&39;t hurt the environment.＜br＞
The scientists are now trying to use different enzymes that will get more power from sugar. They predict that popular products may be using the new technology in as little as 3 years.＜
According to the first paragraph， when can we share our sweet drinks with our cell phones？ 查看材料
A.When enzymes can be commonly found in living cells
B.When the technology of producing a new type of fuel cell appears
C.When the technology of a new type of fuel cell is suitable for mass production
D.When the technology of mass producing cell phones appears
