题目内容：

This activity will melt away the pounds, build your body and leave you on an emotional high. Yet the form of exercise, the fitness trend of the year, does not require gym membership or a personal trainer. All you need to do is walk.

“Walking is a refreshing alternative to complicated aerobic ( 氧) routines and overpriced gym membership,” says personal trainer Lucy Knight, author of a new book on the exercise. “It is free, enjoyable and already a part of everyday life. All you need to do is correct your technique, walk faster and for longer and you will lose weight.”

There is much evidence of the benefits of walking. Scientists at the University of Pittsburgh recently discovered that overweight people who walked briskly ( 快) for 30 to 60 minutes a day lost weight even if they didn’t change any other lifestyle habits. Another American study found that people who walked for at least four hours a week gained less weight than couch potatoes as they got older. Researchers at the University of Massachusetts medical school found that people who walked every day had 25 percent fewer colds than those who sat a lot. Best of all, walking makes you feel good about yourself. “For people suffering from depression, walking three to four times a week for 30 minutes has been shown to lift their mood,” says Knight.

But how to walk your way to weight loss and wellness? Health experts recommend that we should walk 10,000 steps a day to stay healthy. Actually you would probably need to walk at least 16,000 steps a day to lose weight. “Your workout plans depend on your level of fitness. You should aim to progress by increasing your walking time by five minutes every two weeks, and walk a bit faster. In just three months, the results should speak for themselves,” says Knight.

1.What is the latest fitness trend according to the passage?

A. Brisk walking.    B. Losing weight.

C. Working out in a gym.    D. Exercising with a personal trainer.

2.The underlined word “overpriced” in Paragraph 2 means             .

A. expensive    B. worthy    C. prepaid    D. discountable

3.Studies and researches are mentioned in the passage to show walking             .

A. is gaining increasing popularity    B. benefits people in different aspects

C. is an enjoyable way to lose weight    D. involves different groups of people

4.Which of the following statements can be inferred from the last paragraph?

A. 1,600 steps a day is needed for weight losses.    B. The effect of walking is noticeable over time.

C. Your fitness level depends on your health experts.    D. Changing the walking time every day is necessary.