公信力是政府的影响力和号召力。它是政府行政能力的客观结果，也是人民群众对政府的评价，反映着人民群众对政府的满意度和信任度。下列措施能有效提高某市政府公信力的是（     ）

①市城市规划建设局落实科学发展观，推进市民广场绿色工程建设

②市委召开党外人士座谈会，共商该市经济和社会发展的大计

③政府各部门积极履行职责，不断强化自身市场竞争主体角色

④政府各职能部门按《行政许可法》规定，继续推进审批方式改革

科技人员在密闭的玻璃温室里进行植物栽培实验，晴天环境下对室温内二氧化碳浓度进行24小时测定，并绘制如图所示的曲线，下列分析正确的是(    )

例：

    I have a best friend. His name is James. He is from the USA. We look totally(完全) different！I have blonde hair and he has red hair. I wear glasses，but he doesn't. I am short and he is very tall. We both love to sing and dance. But I'm very outgoing and he is very quiet.

    Sam Green

    I don't really have a best friend but one of my good friends is Kristi. She is from America. I sometimes call her Kwiti. She is funny and kind. And she really cares about(关心) everyone and almost everything. She became one of my good friends at the age of five.

    Mary Smith

    My best friend's name is Edna. She is from Australia. She likes to talk a lot and hardly keeps quiet. Edna has curly brown hair and brown eyes. She always makes me laugh. Also，she sometimes helps me with my homework.

    Lisa Brown

    I have a best friend from India. Her name is Sinsha. I call her Kuttu. She is short. She has a round face and black eyes. She has long black hair. You can hardly get sad or angry if you're with her. She often makes me happy.

    Donna