单项选择题 听力原文：M: Hi, Susan, why are you off in such a hurry?W: I've been invited to a cocktail party at 5:30. I need to buy some gift for my friend. Do you know somewhere I can get some fresh flowers?M: Just over there, near the post office. But you told me if invited to a party, you'd better plan to arrive between a half-hour and an hour late. Why are you in such a hurry?W: But not a cocktail party. It's generally set for specific hours, say from 5:30 to 7:30.M: What's a cocktail party like?W: Alcoholic beverages and hors d'oeuvres.M: Only that?W: Yes. People usually don't get dinner at a cocktail party.M: Why do you have such a party?W: It's called by some of my colleagues to celebrate the New Year.M: To celebrate the New Year! Why not have a dinner party?W: Dinner party is so formal for us. We just take it for relaxation. And then some of us may go to a pub.M: For what? You don't celebrate the New Year with your family?W: We just drink and chat. Anyway, New Year is a special day and I only celebrated New Year with my family when I was a little girl.M: It's really fantastic. But you'd better get moving, or you'll be late.W: So long.What is Susan going to do in such a hurry?A．To have a business meeting.B．To attend a cocktail party.C．To visit her friend in hospital.D．To buy some fresh flowers for her friend.

未知题型 材料一：“解放以后，民族资产阶级走上社会主义改造的道路，这是逼出来的。我们打倒了蒋介石，没收了官僚资本，完成了土地改革，进行了‘三反’、‘五反’，实现了合作化，从一开始就控制了市场。这一系列的变化，一步一步地逼着民族资产阶级不能不走上接受改造的道路。” 材料二：“文化大革命”时期曾经提出，要把我们党建设成为“领导无产阶级和革命群众对于阶级敌人进行战斗的无产阶级先锋队组织”。对下列事件排序正确的一项是( )。 ①《中华人民共和国土地改革法》的颁布 ②“三反五反” ③社会主义改造完成 ④“大跃进”D．①②④③

单项选择题 一项研究发现，1970年调查的孩子中有70%曾经有过龋齿，而在1985年的调查中，仅有 50%的孩子曾经有过龋齿。研究者们得出结论，在1970年至1985年这段时间内，孩子们中的牙病比率降低了。 如果为真，以下哪项最能削弱研究者们上面得出的结论?（）