1 . 阅读下面短文，在空白处填入 1个适当的单词或括号内单词的正确形式。

Regular exercise can increase your body's energy consumption and it is also a great way    1    (improve) your productivity and mental focus throughout the day. The increased energy levels that occur as a result of exercise     2    (be) also likely to lead to more active habits throughout the day, such as taking the stairs rather than the lift, or    3    (walk) to speak to workmates instead of emailing. This increased activity will then bring physical and mental benefits.

Physical activity can help us to improve the     4     (long) and the quality of our sleep, which will in turn make further contributions    5    our health and well being. While there is no absolute figure we should aim for in terms of sleep time, most people will find that they fall somewhere between six to nine hours a night. Quality is    6    (sure) more important than quantity.

Regular physical activity can help us to manage life's stress much    7    (well) as a distraction technique. As discussed, exercise can help you achieve a more positive outlook as well as improving sleep quality, both of     8     are important in managing stress. Also,    9     is thought that exercise can help to improve our ability to activate the control centers in our brain and the nervous system, which is very    10     (help) when we are under stress.

2 . Are you the type to run before breakfast in a morning? Working out on an empty stomach won't hurt you ——and it may actually help, depending on your goal.

Exercising before eating comes with the risk of feeling light-headed due to low blood sugar. You might feel tired or uneasy, and won't be able to work out as enthusiastically as you would have. A light amount of food is important for older adults over 55 to eat something before exercising — especially in the morning. But if your primary exercise goal is weight loss, exercising on an empty stomach may come with some promising benefits. There's some research to support the idea that working out in a fasted （禁食的）state can burn more fat than exercising in a fed state.

Working out on an empty stomach, however, may also not prove true for everyone. “Some people advocate for lasted exercise, but these people tend to be young and in amazing physical - shape,” says Douglas Paddon-Jones, a muscle physiology researcher and a professor of aging and health at the University of Texas Medical Branch. “They have no health problems, and what they're eating is super-high quality and carefully regulated.” On the other hand, working out in a fasted state without proper planning or professional oversight may run the risk of unhealthy body composition changes.       

For people who aren't athletes, fueling up with food before a workout may be the best way to get the most fat-burning benefit. “You don't want to fill up； you just want to give your body a burst of energy to power your training period. After you exercise, drink some water ——but wait 60 to 90 minutes before eating, ”says Shivani Sahni, director of the nutrition program at Harvard University's Instituted for Aging Research. “You're trying to take advantage of your promoted metabolic （新陈代谢）rate post-exercise, so if you can go an hour or an hour and a half without eating, you'll maximize the fat-burning response,” says she.

1. Why does the author suggest exercising in a fed state?

A．To avoid being light-headed.	B．To lower blood sugar.
C．To burn more fat.	D．To work out energetically.

2. Who may tend to practise lasted exercise?

A．Older adults.	B．Seniors beyond 55.
C．Professional athletes.	D．Good-shaped athletes.

3. What's Shivani Sahni's suggestion for people after exercising?

A．Developing a new lifestyle.

B．Finding a fitness instructor.

C．Going without food for a time.

D．Drinking salty water after exercising.,

4. Which word best describes the author's attitude to working out in a fasted state?

A．Skeptical.

B．Cautious.

C．Supportive.

D．Subjective .