阅读短文，选择正确的答案。

     Hi, I'm John.There are four seasons in a year. I like them all. In spring, it's warm. There are pretty flowers everywhere. I often go on a picnic with my parents. Summer is hot. I often go swimming in the pool. I like to wear my sunglasses. In fall, the weather is cool. I can help my grandpa pick apples. Winter is white. I can make a snowman. And I can go skating, too.

如图是甲、乙两种固体物质在0°C—50°C之间的溶解度随温度变化的曲线图，某同学从图中获得如下几条信息：①30°C时两种固体物质的溶解度一样；②在0°C—50°C之间，甲、乙两固体物质的溶解度随温度上升而增加；③在0°C—40°C之间，甲、乙两固体物质溶解度相差最多是10g；④在0°C—50°C之间，甲的溶解度比乙的溶解度高．其中正确的信息有：____ （只要填序号即可）．

已知$\left\{a_n\right\}$为等差数列，$a_1+a_3+a_5=105$，$a_2+a_4+a_6=99$，以$s_n$表示$\left\{a_n\right\}$的前项和，则使得$s_n$达到最大值的是（    ）