已知$\frac{3\sin \alpha +3\cos \alpha }{2\sin \alpha +\cos \alpha }$=2，求tanα的值．

 明确宏观现象的微观本质是学习化学的重要思想方法，下列说法正确的是（　　）

找出所给问句的对应答语。

①Can I help you?                                ____                     A. I'd like some oranges.

②What do you need?                          ____                     B. Three.

③How many books do you want?        ____                     C. Yes, I think so.

④Is that all?                                         ____                     D. Yes, I need some milk.

⑤What would you like?                        ____                     E. I need some fish.

下列不属于西部大开发战略中保护生态环境行为的是（　　）