Vaccines can make you sick.A.RightB.WrongC.Not mentioned
Vaccines can make you sick.
A.Right
B.Wrong
C.Not mentioned
Vaccines can make you sick.
A.Right
B.Wrong
C.Not mentioned
第1题
Vaccines can make you sick.
A. Right
B. Wrong
C. Not mentioned
第2题
Vaccines can make you sick
A.Right
B.Wrong
C.Not mentioned
第3题
Vaccines can make you sick.
A.Right
B.Wrong
C.Not mentioned
第4题
A.Y
B.N
C.NG
第5题
A.A career can determine the way you make a friend.
B.A career can determine the way you live.
C.A career can affect the way you feel about yourself.
D.All of the above.
第6题
听力原文:W: I have to think about your offer. I can't say "yes" or "no" at the moment.
M: You can take your time. It will do if you let me know your decision in a day or two.
Which of the following is true?
A.The man thinks the woman is wasting her time.
B.The man thinks the woman should make full use of her time.
C.The man is eager to know the woman's answer.
D.The man can wait and there is no need for her to hurry.
第7题
听力原文:(With) Other viruses, such as smallpox and measles, and polioneuromere, the majority of people mount an immune response even if they never been vaccinated that clears the natural infection. With H1V, there are virtually no incidents of a person who has completely cleared the virus from their body, which means that although some people can control the virus better than others, the body is having trouble making a protective immune response.
What is the point the speaker is trying to make about HIV virus?
A.HIV vaccines trigger an immune response, but that response has proven inadequate.
B.The body's natural immune response to HIV infection could eradicate the virus.
C.The majority of people could mount an immune response even without being vaccinated that clears the natural infection from every virus.
D.Some people can control HIV virus better than others and make a protective immune response.
第8题
Why is such a basic health service so easily knocked out? Mainly because private companies have had little incentive to pursue it. To create a single dose of flu vaccine, a manufacturer has to grow live virus in a 2-week-old fertilized chicken egg, then crack the egg, harvest the virus and extract the proteins used to provoke an immune response. Profit margins are narrow, demand is fickle and, because each year's flu virus is different, any leftover vaccine goes to waste. As a result, the United States now has only two major suppliers (Chiron and Aventis Pasteur)--and when one of them runs into trouble, there isn' t much the other can do about it. "A vaccine maker can't just call up and order 40 million more fertilized eggs," says Manon Cox, of Connecticut-based Protein Sciences Corp. "There's a whole industry that's scheduled to produce a certain number of eggs at a certain time. "
Sleeker technologies are now in the works, and experts are hoping that this year's fiasco will speed the pace of innovation. The main challenge is to shift production from eggs into cell cultures--a medium already used to make most other vaccines. Flu vaccines are harder than most to produce this way, but several biotech companies are now pursuing this strategy, and one culture-based product (Solvay Pharmaceuticals' Invivac) has been cleared for marketing in Europe.
For Americans, the immediate challenge is to make the most of a limited supply. The government estimates that 95 million people still qualify for shots under the voluntary restrictions announced last week. That' s nearly twice the number of doses that clinics will have on hand, but only 60 million Americans seek out shots in a normal year. In fact, many experts are hoping the shortage will serve as an awareness campaign--encouraging the people who really need a flu shot to get one.
Shortages of flue vaccine show that ______.
A.America relies too much on foreign suppliers
B.the demand of flue vaccines is high this year
C.quality problem is a serious problem in flu vaccine production
D.the supply of flu vaccines is rather weak and America has no back-up measures to make it up
第9题
A. Right
B. Wrong
C. Not mentioned
第10题
A.Right
B.Wrong
C.Not mentioned