20. A. bright B. usual

　　C. necessary

　　D. important

　　【解析】选A。逻辑推理题。句意: 如果美国年轻人的英雄只限定于摇滚明星、体育明星和演员, 那么他们的未来看起来很不光明。bright表示“光明的”。

　　. 语法填空

　　阅读下面材料, 在空白处填入适当的内容(不多于3个单词)或括号内单词的正确形式。

　　In order to know a foreign language thoroughly, four things are necessary. Firstly, we must understand the language when we hear　1　spoken. Secondly, we must be able to speak it ourselves correctly with confidence and without hesitation. 　2　, we must be able to read the language, and fourthly, we must be able to write it. We must be able to make sentences that are grammatically correct.

　　There is no easy way to success　3　language learning. 　4　good memory is a great help, but it is not enough only　5　(memorize)rules from a grammar book. It is no much use learning by heart long lists of words and their meanings, studying the dictionary and so on. We must learn　6　using the language. 　7　we are satisfied with only a few rules we have memorized, we are not really learning the language. “Learn through use”is a good piece of　8　(advise)for those　9　are studying a new language. Practice is important. We must practise speaking and　10　(write)the language whenever we can.

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