题目内容
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Multivitamins can lead to poorer overall eating habits in a person's life.
A．YES
B．NO
C．NOT GIVEN
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The author concludes the passage with the advice that______.
A．the benefit of daily multivitamin intake outweighs that of exercise and a balanced diet
B．it's risky to take multivitamins without knowing their specific function
C．the potential benefit of multivitamins can never be overestimated
D．it's reasonable to take a rational dose of multivitamins daily
The speaker thinks that it is probably a good investment to spend a small amount of money on multivitamins though there is uncertain proof of their benefits.
A．正确
B．错误
Section B
Directions: There are 2 passages in this section. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A, B, C and D. You should decide on the best choice.
For years, doctors advised their patients that the only thing taking multivitamins doses is giving them expensive urine (尿). After all, true vitamin deficiencies are practically unheard of in industrialized countries. Now it seems those doctors may have been wrong. The results of a growing number of studies suggest that even a modest vitamin shortfall can be harmful to your health. Although proof of the benefits of multivitamins is still far from certain, the few dollars you spend on them is probably a good investment.
Or at least that's the argument put forward in the New England Journal of Medicine. Ideally, say Dr. Walter Willett and Dr. Meir Stampfer of Harvard, all vitamin supplements would be evaluated in scientifically rigorous clinical trials. But those studies can take a long time and often raise more questions than they answer. At some point, while researchers work on figuring out where the truth lies, it just makes sense to say the potential benefit outweighs the cost.
The best evidence to date concerns folate, one of the B vitamins. It's been proved to limit the number of defects in embryos, and a recent trial found that folate in combination with vitamin B 12 and a form. of B6 also decreases the re-blockage of arteries after surgical repair.
The news on vitamin E has been more mixed. Healthy folks who take 400 international units daily for at least two years appear somewhat less likely to develop heart disease. But when doctors give vitamin E to patients who already have heart disease, the vitamin doesn't seem to help. It may turn out that vitamin E plays a role in prevention but cannot undo serious damage.
Despite vitamin C's great popularity, consuming large amounts of it still has not been positively linked to any great benefit. The body quickly becomes saturated with C and simply excretes (排泄) any excess.
The multivitamins question boils down to this: Do you need to wait until all the evidence is in before you take them, or are you willing to accept that there's enough evidence that they don't hurt and could help？
If the latter, there's no need to go to extremes and buy the biggest horse pills or the most expensive bottles. Large doses can cause trouble, including excessive bleeding and nervous system problems.
Multivitamins are no substitute for exercise and a balanced diet, of course. As long as you understand that any potential benefit is modest and subject to further refinement, taking a daily multivitamin makes a lot of sense.
At one time doctors discouraged taking multivitamins because they believed that multivitamins______.
A．could not easily be absorbed by the human body
B．were potentially harmful to people's health
C．were too expensive for daily consumption
D．could not provide any cure for vitamin deficiencies
【填空题】Task: Audio-visual Exercises AV Clip 14: Daily Multivitamin AV 14 Daily Vitamins No Good.avi Watch the video clip three times and complete the following passage by filling in each blank with the word or information from the video clip. Some 40% of Americans take a (1) ________ pill. It’s a multi-million-dollar-a-year business. And a study of today offers strong evidence that a pill can reduce (2) ________ cancer risk at least for middle-age and older man. Researchers give almost 14,000 male physicians 50 and older either a multivitamin or placebo. After 11 years, those taking the daily vitamin had (3) ________ less cancer of several kinds. “This is the only study of multivitamin testing whether a (4) ________ multivitamin taken with a long haul can prevent (5) ________ diseases,” said Dr. J. Michael Gaziano from Brigham and Women’s hospital. We all heard that not smoking, exercising, eating fresh fruits and vegetables, and (6) ________ our weight can cut our cancer risk. There is a lot of scientific evidence to back that up. But it turns out the main reason so many doctors recommend multivitamins is to ensure their patients get (7) ________ nutrition. “What’s not been well studied and what happened to be a reason that some people take these multivitamins is because they feel they might be (8) ________ kind of diseases like cancer and heart disease.” Dr. J. Michael Gaziano said. In fact, a lot of studies have found that high doses of (9) ________ vitamins do not reduce cancer risk. But this latest research shows that multivitamin with recommended daily doses can (10) ________ help protect against the cancer.
Ventilation ().
A、is a system for moving fresh air
B、can cut indoor pollution to a safe level
C、can cause some diseases
D、is better done through air-conditioning
A．Children younger than 12 can not reason abstractly.
B．Curiosity and willingness to learn enable kids to study philosophy.
C．Children could think abstractly at an early age.
D．Philosophical questioning could help kids develop reasoning skills.
From the passage, it can be anticipated that in the future ______.
A．Ashkenazim would be less intelligent but healthier
B．there would be more outstanding Ashkenazim intellectuals
C．Ashkenazim would be more intelligent and less healthy
D．the cause of genetic diseases would be explored more deeply
How can a student make good notes？
A．Try to make it clearly.
B．To make it not only in the lecture course, but also before class.
C．Try to listen a lot and write down the main points.
D．All of the above.
A sudden drop in diesel engine cylinder compression pressure can be caused by______.
A.a leaking fuel injector nozzle
B.a clogged air filter
C.excessively early fuel injection
D.malfunctioning valves
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