题目

已知函数的部分图象如图所示.（1）求函数的解析式；（2）求方程的解. 答案：【答案】(1) ;(2) 或.【解析】试卷分析:(1)由图象可得三角函数的最值和周期,又函数过,可求得，所以.(2) 由（1）知， ，代入解出x即方程的根.试卷解析:（1）易知，依题有，解得，所以，又， ，解得，所以.（2）由（1）知， ，所以方程可化为，解得或.() 6.         ，it didn't rain this morning.   A. Luck   B. Lucky   C. Luckily   D. Unlucky() 7. —Were the animals interesting?—Yes ?   .   A. it did   B. they did   C. they were   D. it was() 8. —When you the bike?—Two years ago.   A. have;bought   B. have;had   C. did;buy   D. did;bought() 9. 一Did they see any cows?-            .They saw quite a lot.   A. Yes,they do   B. Yes,they did   C. No,they don't   D. No,they didn't() 10. Bill and Bob last Monday.   A. goes fishing   B. went to fishing   C. go to fish   D. went fishing