题目

词汇运用；根据句意或中英文提示，写出句中所缺单词 1. I want to know more about French            (文化). 2. Chinese food has different            (口味). 3. Tom fell down from the tree.             (幸运的是), he didn’t hurt himself. 4. He is going to make a long_______________(旅行). 5. Barack Obama is the _________________(总统)of the USA.已知函数f（x）=sinx+cosx，f′（x）是f（x）的导函数．（1）求函数F（x）=f（x）f′（x）+[f（x）]2的最大值和最小正周期；（2）若f（x）=2f'（x），求的值．