A、They are unreasonable. B、They are varied. C、They are untraceable. D、They are identical. B

How we look and how we appear to others probably worries us more when we are in our teens or early twenties than at any other time in our life. Few of us are content to accept ourselves as we are, and few are brave enough to ignore the trends of fashion.
    Most fashion magazines or TV advertisements try to persuade us that we should dress in a certain way or behave in a certain manner. If we do, we will be able to meet new people with confidence and deal with every situation confidently and without embarrassment. The advertisers show us the latest fashionable styles and we are constantly under pressure to follow the fashion in case our friends think we are odd or dull.
    What causes fashions to change? Sometimes convenience or practical necessity or just the fancy of an influential person can establish a fashion. Take hats, for example. In cold climates, early buildings were cold inside, so people wore hats indoors as well as outside. In recent times, the late President Kennedy caused a depression in the American hat industry by not wearing hats: more American men followed his example.
    There is also a cyclical pattern in fashion. In the 1920s in Europe and America, short skirts became fashionable. After World War Two, they dropped to ankle length. Then they got shorter and shorter until the miniskirt was in fashion. After a few more years, skirts became longer again.
    Today, society is much freer and easier than it used to be. It is no longer necessary to dress like everyone else.