三.完形填空(共15小题：每题2分，共30分。)

　　通读下面的短文，掌握其大意。然后，从每小题的四个选择项中选出最佳选项。

　　Everyone likes things that are free, and businesses often give things for free to customers as a way of getting more people to pay attention to their products.

　　Ariely, a scientist from MIT, did an experiment on what people would do when _21_ things that were free. He _22_ a group of students two kinds of chocolates: the good one for 15 cents each and the poor one for 1 cent each. The good chocolate was worth ﹩1.00, so 15 cents was very cheap, _23_ the poor quality chocolate was worth 5 cents, so _24_ it for 1 cent wasn’t very cheap.

　　Most people chose the high quality chocolate for 15 cents. That’s not a _25_. But then Ariely lowered the _26_ of both pieces of chocolate by 1 cent. If people were _27_ correctly, then they should _28_ choose the good quality chocolate. But that _29_ what happened. Most people chose the free chocolate. This doesn’t make sense in our _30_ way of understanding economic behavior(经济行为).

　　What is happening here? Ariely _31_ that people want to get a good bargain . But they also want to reduce risk(风险). That is, they want to _32_ the chance of making a _33_. If you pay 14 cents for a piece of chocolate, and then you don’t _34_ like it when you eat it, you have lost 14 cents. But when something is free and you don’t like it, you haven’t lost anything. People would _35_ not to take a risk over getting a better bargain

　　21. A. facing B. buying C. giving D. treating

　　【导师解析】A.根据意思来选择。Ariely做了一个实验，关于当人们面对免费东西时会做什么的实验。表示面对只有A

　　22. A. posted B. produced C. offered D. told

　　【导师解析】C. 他给了一群学生两种巧克力.offer表示提供，给。

　　23. A. if B. as C. for D. but

　　【导师解析】D 根据此句话的意思：高质量的巧克力值﹩1.00，所以15分是非常便宜的，下一句是低质量的值5分，所以两句间应该是转折关系，用but.

　　24. A. getting B. holding C. eating D. making

　　【导师解析】A.这里的getting相当于buying.根据句意，因此用一分钱买不是很便宜。

　　25. A. dream B. reason C. reply D. surprise

　　【导师解析】D。根据上文的分析，大多数人选择高质量的巧克力不是一件惊奇的事情。

　　26. A. weight B. size C. price D. quality

　　【导师解析】C。根据上下文，下文是降低了巧克力的价格。所以这里应该是lower the price.

　　27. A. working B. thinking C. planning D. looking

　　【导师解析】B.如果人们正确的思考，他们仍然应该选择高质量的巧克力。

　　28. A. still B. once C. almost D. even

　　【导师解析】A。still 仍然，还。符合题意。

　　29. A. should be B. shouldn’t be C. is D. isn’t

　　【导师解析】D。根据下文，那不是按照正确思考所发生的。

　　30. A. easy B. old C. normal D. modem

　　【导师解析】C。根据此句的意思，这不是我们对经济行为的正常理解。

　　31. A. questioned B. explained C. agreed D. added

　　【导师解析】B。上文讲到人们的行为不正常，所以Ariely对此进行了解释…….

　　而不是质疑question, 或agree。

　　32. A. find B. leam C. lower D. take

　　【导师解析】C。根据下文，他们想降低犯错误的风险。

　　33. A. decision B. mistake C. promise D. waming

　　【导师解析】B。make a mistake 是固定短语。

　　34. A. usually B. gradually C. certainly D. actually

　　【导师解析】D。根据句意，当你吃巧克力的时候，你实际上并不喜欢它，你就失去了14分。

　　35. A. start B. prefer C. manage D. afford

　　【导师解析】B。根据句意，人们更愿意不冒风险而得到更好廉价物。