题目

In recent years, more and more people like dancing in public. We _________ this kind of dance “Guangchangwu”. About the dancing, people have _________ views.Some people think it is a form of entertainment and physical exercise. It gives the elderly a good way to _________, keep fit and enrich (使充实) their life. It’s a _________ better choice for the elderly to go out to dance with their neighbors and friends than to play cards or watch TV at home, because the elderly need to keep _________ and social.However, not all people have the same view. You may have the following experiences:已知集合,.设全集为, 若,则实数的取值范围是.     (     )  A．    B．     C．    D．