近十年来，我国老年人口数量和比重持续上升，养老问题日益突出，出现了公立养老院一床难求住不上，私立养老院价格昂贵住不起的局面。解决“住不上”和“住不起”的难题需要（    ）

①增强劳动者的理财意识，并要求劳动者购买商业养老保险

②发挥财政的作用，实现城乡居民社会养老保险制度全覆盖

③通过税收优惠等政策，加大对社会养老服务业的扶持力度

④政府统一承担社会养老等公共服务，弥补市场调节的不足

图中含油气构造的油页岩从成因上来说属于____ ，最底层的辉石含有气孔构造，属于   ____ 类岩石中的____ 岩，具有气孔构造的原因是____ 。

    There is a zoo near my house. I like ____  there. There are many ____  in it.
    Look! There is a koala ____  the tree. Isn’t he ____ ? Under the tree, there is a ____ . Her neck(脖子) is so long. She is a lovely girl. ____  is the panada? She is eating the bamboo(竹子). She's ____  shy. But the elephant is interesting. He is playing with kids with his____ nose. They are very funny. Look! In the pool, there are two dolphins. They are playing with ____  balls. ____  happy they are !

 如图是A、B、C三种物质的溶解度曲线，据图回答：

（1）____ ℃时，A和B两种物质的溶解度相同；

（2）t₃℃时，将A、B、C三种物资的饱和溶液各100g，分别蒸发5g水，析出晶体最多的是____ ．