我国“全面实施一对夫妇可生育两个孩子政策，积极开展应对人口老龄化行动”。从哲学基本问题的角度看，“人口政策的调整” 体现了（    ）

①意识对物质具有反作用

②世界的本源是物质，物质决定意识

③思维和存在具有同一性

④思维是对存在的如实反映

Dear Mum,

    How are you?

    I'm very well in Shanghai. It's a beautiful city. I like the place. And I made a new friend. Her name is Huanhuan. She's got long and black hair. She's got big eyes. She is tall and thin. She's clever. But she is a bit shy. She likes English best. And she works hard. She often helps me. I miss you. I will be back next month.

Love,

Belinda

—Do you have Mary's address? 

—Sorry, I don't have it ______ me  at  present．

如图，⊙O中，弦AB等于半径OA，点Ｃ在优弧AB运动上，则∠ACB的度数是（   ）