15. A。没有一个人看出这时双胞胎交换了一下。B项不可带of。
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Have you ever seen the advertisement: Learn a foreign language in six weeks, 1 give your money back? Of course, it 2 happens quite like that. The only language 3 to learn is the mother language. And think 4 practice is needed for that. Before the Second World War people usually learned a foreign language 5 the literature(文学) of the country. Now most people want to 6 a foreign language. Every year millions of people start learning 7 . How do they do it? Some people try at home 8 books and tapes, others go to evening classes or watch TV programs. 9 they use the language only 2 or 3 times a week, learning it will 10 a long time, like language learning at school. A few people try to learn a language fast by studying for 6 or 11 hours a day. It's much easier to learn the language in the country where it 12 . But most people are 13 to do this, and many people don't have to do so. Machines and good books will be very 14 , but they can not do the students' work. 15 the language is learned quickly or slowly, it is hard work. 1. A. so B. or C. and D. but 2. A. can＇t B. impossible C. never D. often 3. A. easily B. difficult C. able D. easy 4. A. how much B. how long C. how fast D. how many 5. A. studied B. to study C. studying D. study 6. A. talk B. tell C. speak D. say 7. A. them B. this C. that D. it 8. A. without B. with C. in D. by 9. A. If B. When C. Since D. Until 10. A. spend B. use C. take D. cost 11. A. some B. more C. other D. less 12. A. speaks B. is speaking C. spoke D. is spoken 13. A. able B. possible C. unable D. not possible 14. A. careful B. forgetful C. wonderful D. helpful 15. A. either B. whether C. what D. how
名师点评
本文主要想告诉读者，学英语是一个长期而艰苦的劳动，没有任何捷径可走。无论你用什么方法学习--用书、机器或在学校，不多实践就无法达到预期的目的。
答案简析
14. D。
12. D。只有D项时态正确。
11. A。have a week off 休息一个星期。
10. B。“找到一份工作”可用get/find a job, 但此处应用过去时。
9. D。指中学生涯的最后一个假期。
8. B。根据上下文可知, 直到大学, 这种情况才有所改变。
7. C。根据后面的系动词were, 应用both表复数。
6. D。
5. A。“称呼某人……”用call sb. …。