【答案】

　　1.A) critical, 批判的、批评的. D不能搭配题干中的attitude towards foreign students, 又因本文立场明确, 故B也不对. A是完全不对。

　　2.D) prejudiced, 有成见的. 出现地点：There has been a lot of unfair and biased criticism of families who welcome foreign students into their homes. 通过unfair and可推断出biased也为反面意思, 只有D是反面意思. 这几个词可以记一记。

　　3.B) A host family usually has no alternative but to accept the student assigned对应原文第三段第一句The problem is that the host family cannot inspect students or refuse to accept the ones who look dirty, unreliable or noisy. 第二段和第三段亦刚好可以用来解释ACD为什么是错的。。。

　　4.标准答案为B) foreign students come to stay with their host families to learn English, 怕是又错了。。。偶觉得该选C)a hostess does not make much profit because she has to buy new furniture. 首先A和D都是明显错的, B中的learn English只是最后一句有所提及, It’s time foreign students were taught to be polite and to behave properly, as well as how to speak English, 但这个learn English和stay with their host families的关系并非B所讲的那样. C对应原文第四段, 最多是because后面的内容不全面, 但比ABD看起来要好。。。个人意见, 欢迎讨论。。。

　　5.C)to complain about the irresponsibility of foreign students, 本文的主旨。