When fatty acids undergo β-oxidation in liver,which compound will not be produced?
A.H2O
B.Acetyl-CoA
C.Acyl-CoA
D.NADH
- · 有4位网友选择 C,占比44.44%
- · 有4位网友选择 A,占比44.44%
- · 有1位网友选择 B,占比11.11%
A.H2O
B.Acetyl-CoA
C.Acyl-CoA
D.NADH
A、right; rises
B、right; falls
C、left; falls
D、left; rises
A、Please look at the menu first
B、Thank for your kind invitation.
C、You go ahead.
D、I hope we can meet again.
阅读理解。 |
America is a country on the move. In unheard-of numbers, people of all ages are exercising their way to better health. According to the latest figures, 59 percent of American adults exercise regularly-up 12 percent from just two years ago and more than double the figure of 25 years ago. Even non-exercisers believe they would be more attractive and confident if they were more active. It is hard not to get the message. The virtues of physical fitness are shown on magazine covers, postage stamps, and television ads of everything from beauty soaps to travel books. Exercise as a part of daily life did not catch on until the late 1960s when research by military doctors began to show the health benefits of' doing regular physical exercises. Growing publicity (宣传) for races held in American cities helped fuel a strong interest in the ancient sport of running. Although running hasleveled offin recent years as Americans have discovered equally rewarding-and sometimes safer- forms of exercise, such as walking and swimming, running remains the most popular form of exercise. As the popularity of exercise continues to mount, so does scientific evidence of its health benefits. The key to fitness is exercising the major muscle groups vigorously (强有力地) enough to approximately double the heart rate and keep it doubled for 20 to 30 minutes at a time. Doing such physical exercises three times or more a week will produce considerable improvements in physical health in about three months. |
1. It can be learnt from the passage that the health benefits of exercise ____. |
A. are to be further studied B. are self-evident C. are yet to be proved D. are supported by scientific evidence |
2. A growing interest in sports developed after ____. |
A. an increasing number of races were held in American cities B. research showed their health benefits C. scientific evidence of health benefits was shown on TV ads D. people got the message from magazine covers and postage stamps |
3. Which of the following would be the best title for the passage? |
A. Exercise-The Road to Health B. Scientific Evidence of Health Benefits C. Different Forms of Exercise D. Running-A Popular Form of Sport |
4. Which of the following is closest in meaning to the phrase "leveled off" in the paragraph 2? |
A. Reached its lowest level in popularity. B. Stopped being popular. C. Stopped increasing in popularity. D. Become very popular. |
Evolution is mostly to blame. It has designed mankind to cope with deprivation, not plenty. People are perfectly tuned to store energy in good years to see them through lean ones. But when bad times never come, they are stuck with that energy, stored around their expanding bellies.
Thanks to rising agricultural productivity, lean years are rarer all over the globe. Modernday Malthusians, who used to draw graphs proving that the world was shortly going to run out of food, have gone rather quiet lately. According to the UN, the number of people short of food fell from 920m in 1980 to 799m 20 years later, even though the world's population increased by 1.6 billion over the period. This is mostly a cause for celebration. Mankind has won what was, for most of his time on this planet, his biggest battle: to ensure that he and his offspring had enough to eat. But every silver lining has a cloud, and the consequence of prosperity is a new plague that brings with it a
host of interesting policy dilemmas.
As a scourge of the modern world, obesity has an image problem. It is easier to associate with Father Christmas than with the four horses of the apocalypse. But it has a good claim to lumber along beside them, for it is the world's biggest public-health issue today—the main cause of heart disease, which kills more people these days than AIDS, malaria, war; the principal risk factor in diabetes; heavily implicated in cancer and other diseases. Since the World Health Organisation labelled obesity an "epidemic" in 2000, reports on its fearful consequences have come thick and fast.
Will public-health warnings, combined with media pressure, persuade people to get thinner, just as they finally put them off tobacco? Possibly. In the rich world, sales of healthier foods are booming (see survey) and new figures suggest that over the past year Americans got very slightly thinner for the first time in recorded history. But even if Americans are losing a few ounces, it will be many years before the country solves the health problems caused by half a century's dining to excess. And, everywhere else in the world, people are still piling on the pounds. That's why there is now a consensus among doctors that governments should do something to stop them.
The author write this passage mainly to ______.
A.bring up some warnings.
B.tell the reader some new facts.
C.discuss a solution to a problem.
D.persuade the reader to keep fit.
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