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cell culture细胞培养
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更多“cell culture细胞培养”相关的问题
第6题
How could the breakup potentially hurt the interest of consumers？
A．The breakup led to a setback: Windows 2000 won't be shipped to consumers until February, two years behind schedule.
B．The pay-per-minute model of the cell phone industry will meld with the free culture of the Internet.
C．The breakup could increase the operating costs and thus make their products more expensive.
第7题
Mobile phones
What Are Mobile Phones？
A mobile phone, also known as a cellphone or cellular phone, is a portable electronic device which behaves as a normal telephone whilst being able to move over a wide area (compare cordless phone which acts as a telephone only within a limited range). Cellphones allow connections to be made to the telephone network, normally by directly dialing the other party's number on an inbuilt keypad. Most current cellphones use a combination of radio wave transmission and conventional telephone circuit switching, though packet switching is already in use for some parts of the cellphone network, especially for services such as Internet access and WAP.
Some of the world's largest cellphone manufacturers include Alcatel, Audiovox, Kyocera (formerly the handset division of Qualcomm), LG, Motorola, Nokia, Panasonic (Matsushita Electric), Philips, Sagem, Samsung, Sanyo, Siemens, SK Teletech, and Sony Ericsson.
There are also specialist communication systems related to, but distinct from cellphones, such as satellite phones and Professional Mobile Radio.
Worldwide Deployment
Cellphones have a long arid varied history that stretches back to the 1950s, with hand held devices being available since 1983. Due to their low establishment costs and rapid deployment, cellphone networks have since spread rapidly throughout the world, outstrip ping the growth of fixed telephony.
In most of Europe, wealthier parts of Asia, Australia, and the US, cellphones are now widely used, with the majority of the adult, teenage, and even child population owning one. The number of cell phone subscribers in the US has reached over 190 million. The availability of Prepaid or pay as you go services, where the subscriber does not have to commit to a long term contract, has helped fuel this growth.
Standardized Technology
The cellphone has become ubiquitous because of the interoperability of cellphones across different networks 4nd countries. This is due to the equipment manufacturers all working to the same standard, particularly the GSM standard which was designed for Europe-wide interoperability. All European nations and some Asian nations chose it as their sole standard, while in Japan and South Korea another standard, CDMA, was select ed.
Cellphone Culture
In less than twenty years, mobile phones have gone from being rare and expensive pieces of equipment used by businesses to a pervasive low-cost personal item. In many countries, cellphones now outnumber land line telephones, with most adults and many children now owning cellphones. It is not uncommon for young adults to simply own a cell phone instead of a land-line for their residence. In some developing countries, where there is little existing fixed-line infrastructure, the mobile phone has become widespread.
Social Life
With high levels of mobile telephone penetration, a mobile culture has evolved, where the phone becomes a key social tool, and people rely on their cellphone addressbook to keep in touch with their friends. Many people keep in touch using SMS, and a whole culture of "texting" has developed from this. The commercial market in SMS's is growing. Many phones even offer Instant Messenger services to increase the simplicity and ease of texting on phones.
Entertainment
The mobile phone itself has also become a totemic and fashion object, with users deco rating, customizing, and accessorizing their cellphones to reflect their personality. Like wise, customized ringtones have been developed.
Etiquette
Cellphone etiquette has become an important issue with mobiles ringing at funerals, weddings, movies and plays. Users often speak at increased volume, with little regard for others nearby people. It has become common practice for places like libraries and movie theatres to ban the use of cell phone
A．Y
B．N
C．NG
第8题
Studying human beings biologically and physiologically leads us to very different conclusions about how alike or different we are from each other. Very different indeed, every human being on the planet, all 5.3 billion of us, has the same number of bones, of the same type, serving the same purposes; each of us has 46 chromosomes, 23 from each parent, and these chromosomes, genes and the DNA and RNA of which they are integral parts, are in every single human being; every cell, every membrane, every tissue, and every organ is the same everywhere. We all have a heart, a circulatory system, 2 lungs, a liver, 2 kidneys, a brain and nervous system, a reproductive system, digestive and excretory systems, musculature, in short, we are the same biologically and our bodies perform. the same functions everywhere on the planet. And as we learned in Shakespeare's The Merchant of Venice, if you prick us, any of us, "do we not bleed"？ Of course we do, and
we bleed red blood no matter what the color of our skin, or the language we speak, the clothing we wear, the gods we worship, .or our geographical home. Man is of a Piece biologically; all equally effective organisms whether Amazon Indian, Australian aborigine, Parisian artist, Greek sailor, Chinese student, American astronaut, Russian soldier, or Palesfinian citizen.
Well then, you ask, how is that so many groups of people disparage other groups, persecute them, and claim superiority over them？ Why is it that some groups of people still hunt animals, wear little or no clothing, have little or no technology, while others are very sophisticated in their technology, industry, transportation, communication, food gathering and storage？ It is, of course, a matter of culture and the civilization that emerges and evolves from it. Though man is man everywhere, where he lives, when he lives there, with whom he lives there, all affect how he lives: that is, what he believes, what he wears, his customs, his gods, his rituals, his myths and literature, his language and his institutions. These are man-made artifacts that each group develops over time, living together, facing the same problems, needing and desiring the same things. They axe his culture, his identity.
The interactions of two powerful forces in all human life: nature (biology) and nurture (culture and civilization), shape us. Each culture has its own distinctive ways of seeing, feeling, thinking, speaking, believing, and just as no two humans are identical in all respects, so no two cultures are identical in all respects. But, wherever humans have lived and live today, there is culture with all of its elements embedded in a civilization that expresses that core of thought and feeling in its language, its institutions and other social organizations. All civilizations and the cultures that nourish them have hierarchies; social institutions, language, art of all kinds, religion or a system of spiritual beliefs of some kind, laws, customs, rituals (other than religious) and ceremonies.
A study of anthropology and make it very clear that humans have created divisions and exacerbated superficial external difference for their own ulterior purposes whether political, social, economic or religious. The truth is that we are much more alike in very basic ways than we are different. If you wear one type of garment and I wear another, we both wear some kind of garment. Our culture demands it. If you speak one language and I another, we both speak so that others will understand us; we must communicate with each other. Nothing is gained
A．Racial difference.
B．Civilization difference.
C．Cultural difference.
D．Biological difference.
第9题
根据以下材料，回答题
More about Alzheimer"s Disease
Scientists have developed skin tests that may be used in the future to identify people with Alzheimer"s diseasel and may ultimately allow physicians to predict 51_______ is at risk of getting this neurological disorder.
The only current means of 52_______ the disease in a living patient is a long and expensive series of tests that eliminate every other cause of dementia.
"Since Alois Alzheimer described the 53_______ nearly a century .ago， people have been trying to find a way to 54_______ diagnose it in its early stages， " said Patricia Grady， acting director of the National Institute of Neurological Disorders and Stroke in Bethesda， Maryland. "This discovery， if 55_______ ， could prove a big step forward in our efforts to deal with and understand the disease. "
Alzheimer"s is the single greatest 56_______ of mental deterioration in older people， affecting between 2.5 million and 4 million people in the United States 57_______. The devastating disorder gradually destroys memory and the ability to function， and eventually causes death. There is currently no known 58_______ for the disease.
Researches 59_______ that the skin cells of Alzheimer"s patients have defects that interfere with their ability to regulate the flow of potassium in and out of the cells. The fact that the cell defects are present in the skin suggests that Alzheimer"s 60_______ from physiological changes throughout the body， and that dementia may be the first noticeable 61_______ of these changes as the defects affect the cells in the brain， scientists said.
The flow of potassium is especially critical in cells responsible for memory formation. The scientists also found two other defects that affect the cells" supply of calcium， another 62_______ element.
One test developed by researches calls 63_______ growing skin cells in a laboratory culture and then testing them with an electrical detector to determine if the microscopic tunnels that 64_______ the flow of potassium are open. Open potassium channels create a unique electrical signature.
A spokesman for the Alzheimer"s Association said that if the validity of the diagnostic test can be proven it would be an important 65_______， but cautioned that other promising tests for Aizheimer"s have been disappointing.
回答（51）题 查看材料
A.what
B.one
C.it
D.who
