已知函数f（x）是定义在R上的偶函数，且在区间0，+∞）上是增函数．令a=f（sin$\frac{2\mathrm{\pi }}{7}$），b=f（cos$\frac{5\mathrm{\pi }}{7}$），c=f（tan$\frac{5\mathrm{\pi }}{7}$），则（　　）

下列事实不能用同一原理解释的是（　　）

有关现代生物技术的叙述，不正确的是（  ）

    It is Sunday today. Anna goes shopping with her mother. She wants her mother to buy a new coat for her. In Hongxing Shop, she finds a green coat. She tries it on. It's too small. She wants a big one, but the big one is not green. Anna doesn't like other colors.” Let's go to another(另外的)  shop to have a look.”her mother says. Then they go to Jiajiale Shop. The shop is big and they see many kinds of coats in different colors and sizes(尺码). Anna tries on a green one. It looks nice on her. So they take it for forty-five yuan.