①承担大国责任，贡献“中国力量”    ②展示改革成就，分享“中国经验”

③注重合作开放，提供“中国方案”    ④参与全球治理，发出“中国声音”

阳阳对108名同学的消费行为进行了问卷调查。如图所示的统计结果，反映了学生消费行为存在的问题是（   ）

①浪费严重          ②非理性消费

③注重精神需求    ④节约意识淡薄

根据短文理解选择正确答案。

                                                        Keeping a diary—a good way to improve English

     When I was at the age of thirteen, I began to keep a diary in English. At first it seemed difficult to me, but now it has begun to be easy. I know it's not possible to learn English well without more practice, I like reading, listening and speaking. After school I often go to the school library to read English stories. My English teacher always helps me translate some passages into Chinese. 

     I have little time to watch TV, or to play computer games. After I finish writing my diary, I always try to correct mistakes with the help of the dictionary. I think that keeping a diary is one of the best ways to improve our English study. 

在某次光电效应实验中，得到的遏止电压U_e与入射光的频率v的关系如图所示，若该直线的斜率和纵截距分别为k和b，电子电荷量的绝对值为e，则普朗克常量可表示为____，所用材料的逸出功表示为____．