题目内容：
The “show business”attracts many young people. 21 , only very few can hope to become 22. Talent(才能）is not 23. Without a good manager, a performer can never hope to succeed. Fashion(时尚 )is also important in this business. The best tailor in the world will never be successful if he makes old-fashioned clothes. In exactly the same way, a performer must 24 his “act” in order to 25 the taste of the moment. This is true for actors and dancers, but perhaps most of all for 26. “Pop”stands for “popular”, and a pop singer has to 27 hard to become popular. He must either give the public what they want, or he must find a new way of singing that will attract their attention. Even when he has succeeded, and his records are sold everywhere, he cannot 28. He must work harder than ever to 29 popular, 30 there are always younger singers trying to become famous. The life of a successful pop singer is 31 . He can only relax when he is 32 , because everything he does is watched and reported in the special newspaper written for the “fans”. The fans are the most important people in the world for the singer. They buy his records, they go to his concerts, and they make him rich and famous. But they can be very troublesome, too. They sometimes 33 handkerchiefs, they tear off buttons, and they even cut off pieces of the unfortunate singer's hair. Many singers have been forced to 34. A pop singer has to spend a lot of money on35 ,because he must always look smart. He must have a nice car. And above all, he must always keep smiling for the benefit of his public.
根据以上内容,回答题.
第21答案是（ ） A．Unfortunately
B．Therefore
C．Naturally
D．Luckily
参考答案：
答案解析：