22. What does "this" in paragraph 4 mean?

A. Every dream was an empty girl's caprice.

B. Her wishes were fulfilled one by one as time went by.

C. She could enjoy her life and chase her dream freely.

D. The fulfilment of the wishes didn't give her joy and happiness.

23. According to the passage, we'll be happy if we

A. meet a kind enchantress

B. realize all our small dreams

C. live an extraordinary life and enjoy it

D. work hard for one precious dream

B

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