题目

根据句意及汉语提示，写出单词。 1. We should use a _____（词典）more often when we meet new words. 2. Miss Gao is a journalist. She has written many good _____（文章）. 3. English is the official _____（语言）in his country. 4. What’s wrong with your _____（舌头）? 5.Paul is a shy(害羞的) boy who can’t _______(交流) very well. 答案：1. dictionary 2. articles 3.language 4. tongue   5. communicate26、已知y1=x2-2x4-3；y2=x3-2x5-3，当x=2008时，y1=a，y2=b；当x=-2008时，y1=c，y2=d；求|a-c|+b+d，把你发现或猜想的结论写下来．