week6四级笔试模拟试卷3
穷人也是人 冷漠week6四级笔试模拟试卷3
Part I Writing
2. 打字在哪些方面能代替手写，哪些方面不能
3. 练习手写字（或书法）是否还有必要
Part II Reading Comprehension (Skimming and Scanning)
Directions: In this part, you will have 15 minutes to go over the passage quickly and answer the questions. For the first seven questions, choose the best answer from the four choices marked A), B), C) and D). For the last three questions, complete the sentences with the information given in the passage.
A Healthy Mix of Rest and Motion
Some gym goers are tortoises (乌龟). They prefer to take their sweet time, leisurely riding or walking along on a track. Others are rabbits, impatiently racing through miles at high speed. But new findings suggest that for at least one exercise a week it pays to be both tortoise and rabbit—changing between short bursts of hard exercise and easy easy-does-it recovery.
Weight watchers and those who simply want to increase their fitness (健康) all stand to gain. This fast-slow changing technique, called interval training, is hardly new. For decades, serious athletes have used it to improve performance. But new evidence suggests that an exercise with steep peaks and valleys can greatly improve heart fitness and raise the body's potential to burn fat.
Best of all, the benefits become evident in a matter of weeks.
"There's definitely renewed interest in interval training," said Ed Coyle, the director of the human performance laboratory at the University of Texas at Austin.
A 2005 study published in the Journal of Applied Physiology(生理学) found that after just two weeks of interval training, six of the eight college-age men and women doubled their endurance, or the amount of time they could ride a bicycle at moderate speed before getting very tired.
Eight volunteers in a control group, who did not do any interval training, showed no improvement in endurance. Researchers at McMaster University in Hamilton, Ontario, had the exercisers run for 30 seconds, then either stop or ride gently for four minutes.
小爸爸音乐Such a sharp improvement in endurance after 15 minutes of intense cycling spread over two weeks was all the more surprising because the volunteers were already quite fit. They jogged, biked or did exercise two to three times a week.
Doing bursts of hard exercise not only improves heart fitness but also the body's ability to burn fat, even during slow or moderate exercises, according to a study published this month. Eight women in their early 20s cycled for 10 sets of four minutes of hard riding, followed by two minutes of rest. Over two weeks, they completed seven interval exercise
白恩s.
After interval training, the amount of fat burned in an hour of continuous moderate cycling increased by 36 percent, said Jason L Talanian, the lead author of the study and an exercise scientist at the University of Guelph in Ontario. The ability of the heart and lungs to supply oxygen to working muscles improved by 13 percent. It didn't matter how fit the subjects were before. The college athletes had similar increases in fitness and fat burning. "Even when interval training was added on top of other exercise they were doing, they still saw a significant improvement," Mr Talanian said.numb歌词翻译
That said, this was a small study that lacked a control group, so more research would be needed to confirm that interval training was responsible.
Interval training isn't for everyone. "Pushing your heart rate up very high with intensive interval training can put a strain on the heart, provoking a heart attack or stroke in people at risk," said Walter R Thompson, professor of exercise science at Georgia State University in Atlanta.
For anyone with heart disease or high blood pressure—or who has joint health problems or is older than 60—experts say to consult a doctor before starting interval training.
Still, anyone in good health might consider doing interval training once or twice a week. Joggers can change between walking and running. Swimmers can complete a couple of fast races, then four more slowly.
There is no single accepted formula for the ratio between hard work and a moderate pace or resting. In fact, many coaches recommend varying the duration of activity and rest.
狼烟起 江山北望But some guidelines apply. The high-speed phase should be long and hard enough that a person is out of breath—typically one to four minutes of exercise at 80 to 85 percent of their maximum heart rate. Recovery periods should not last long enough for their pulse to return to its resting rate.
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