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之后，上级令此建筑公司售出办公楼，这期间办公楼市场价格未发生任何变化，设此时该办公楼的售价为P，在正常市场条件下，P最可能的取值为()。
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The recent fire-related accidents were caused by ______.
SECTION B INTERVIEW
Directions: In this section you will hear everything ONCE ONLY. Listen carefully and then answer the questions that follow. Questions 1 to 5 are based on an interview. At the end of the interview you will be given 10 seconds to answer each of the following five questions.
Now listen to the interview.
听力原文： Getting in Shape
Interviewer: Ralph, we know that you have done some of the largest studies on exercise and health. Would you like to give us some tips on how to exercise and keep fit？
Ralph: I would be glad to.
Interviewer: I have been doing what I can to stay healthy. But some of my friends they are mostly young and healthy couldn't care less. They say they are doing fine without exercise. Is regular workout really that important？
Ralph: Sure it is. If one doesn't exercise regularly, he's missing out a lot. A person who is inactive may increase his chance of disease. For one thing, he may have sleep problems or easily catch a cold, to say the least. And obesity is often the result of lack of exercise. So high blood pressure or heart problems may develop as he grows old. On the other hand, if one adds regular activity to his life, he is sure to benefit.
Interviewer: What are some of the benefits, can you tell us？
Ralph: Yes. If you work out regularly, studies suggest, you'll reduce your risk of heart attack, cancer, and high blood pressure. You're likely to extend your life with vigorous exercise. Even moderate exercise half an hour of light physical activity most days will lessen your chance of disease. Besides, regular workouts, regardless of intensity, can help you control stress, anxiety, and depression. Interviewer: Hmmm... That sounds amazing. No wonder I will feel restless if I omit one or two sessions when I am too busy. But another question is, what types of exercise are there to keep fit？
Ralph: Basically, there are four types of workout that help us get in shape. The first type is cardiovascular exercise. This exercise helps strengthen the heart by working it harder. Swimming, running, brisk walking, vigorous rowing, or just anything that you need to exert yourself to do to burn calories and make the heart beat faster. Eventually, your heart becomes more efficient and your pulse rate will be slower at a given level of exertion.
Interviewer: Like an athlete, you mean？
Ralph: Exactly. But an athlete strives to do his best to come out first, while we want simply to stay healthy.
Interviewer: Right. What about the second type？
Ralph: The second type is endurance exercise. That trains the heart, lungs, and muscles to work hard for a longer time. Thus, while regular 20minute walks may help you live longer, regular one-hour walks can help you play longer. The third type is strength training, which builds muscles. The improvement is little felt and fleeting at first, but regular use of the same muscles eventually increases their size and strength.
Interviewer: You mean like those body-builders who have got enormous and beautiful muscles？
Ralph: Not exactly. Strength training isn't just for the vain; having stronger back and abdominal muscles, for example, supports your spine, making back trouble less likely.
Interviewer: I see.
Ralph: The fourth type is flexibility exercise, which keeps muscles long and supple, so they're less likely to be injured.
Interviewer: Do we have to engage in all those forms of exercise in order to stay in shape？
Ralph: Not necessarily. It all depends on your need, and also age. Younger people could engage in more vigorous activities or deliberate workouts, while the older people could just try anything that burns a little more calories, like walking or even gardening. The word "exercise" can be quite loosely defined. It can include out-of-the gym activities such as lawn-mowing, leaf. raking or even cleaning the house. Just about any amount of
It is implied that cloning draws fierce criticism from ethicists, religious leaders and US
When a Massachusetts biotech company recently declared that its researchers had cloned human embryos, it conjured up scary images for many people: bad science-fiction movies, Hitler's twisted ambitions, rows and rows of identical humans.
But, like most things in life, the truth is a lot more complicated, more subtle.
The announcement drew a storm of criticism. Ethicists, religious leaders and US President Bush denounced Advanced Cell Technology for going too far. Scientists charged that the experiment was hyped and called it a failure.
The news put a spotlight on the field of cloning, from work with animals to researchers' efforts to use cloning to create tissues for people suffering from debilitating and fatal diseases.
At its most basic level, cloning means creating copies, and in many ways, cloning has been around a long time. When someone cuts a shoot off a green spider plant and re-pots it, that person is creating a clone. Scientists clone or copy genetic material, or DNA, to match suspects to crimes. By copying cells, researchers have been able to create and test drugs. Scientists even use cloning techniques to create copies of the human gene for insulin to help make insulin for people with diabetes.
"Cloning per se is not bad. The ability to clone and make lots of copies of DNA molecules and cells is part of the entire biological revolution and all sorts of good stuff," sags Larry Goldstein, professor of cellular medicine at the University of California, San Diego, School of Medicine.
Cloning a whole animal or a human being, however, is a much more difficult proposition, even without considering the moral implications. The basic method sounds deceptively simple. Scientists allow an egg to mature in a culture dish. They strip out the genetic material from this egg. Then they insert the genetic material of a separate cell, an adult cell. Next, using a chemical mixture or electrical stimulation, researchers trick the egg into thinking it has been fertilised by sperm. This will activate the cell to start dividing.
Essentially, scientists are trying to reprogramme the egg to create a new organism. It's an excruciatingly difficult process. During the past several years, scientists around the world have used this method to clone animals. They've created about a half-dozen different species, including the famous first sheep, Dolly, along with cows, mice, goats and pigs. Experts say these cloned animals could offer a great deal, from herds that produce more milk, to genetically modified animal organs that could be used for transplantation in humans, and even to cattle that lack the gene that makes them susceptible to mad cow disease.
But it has been a tough process. For each species, scientists have had to work out subtle variations on the basic cloning steps, including how to treat the donor cell and what type of stimulation to use to spark the egg to start dividing. Still, fewer than 1% of these cloned embryos produce live offspring.
Even those born alive have abnormalities--some become obese very quickly, some suffer neonatal respiratory failure. Those that die do so suddenly, and scientists can't figure out why.
There is no consensus about what is going wrong in these experiments or why, except that something must be awry in the genetic reprogramming. But almost all scientists agree that aside from the moral debate, cloning hasn't been perfected enough to try in humans.
Professor Larry Goldstein may agree on all of the following statements EXCEPT______.
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