题目

根据短文内容，从短文后的方框中的选项中选出能填入空白处的最佳选项。选项中有一项为多余选项。 I'm Frank. Today isDecember 24th. It's my sister Sally's tenth birthday. In the morning, my parentstake us to Lucky Clothes Store first Then we go to GreenBookstore. In another store, myfather buys a basketball for her. In the afternoon, myparents have a birthday party for Sally at home . Nick gives Sally a new pencil box. Anna givesher a dictionary . We play games and eatfruit at the party. We are really happy today. A. There I buy an art book fo下图为固体M（不含结晶水）的溶解度曲线，a、b两点分别表示M物质韵溶液．下列有关说法或a、b间的转化方法错误的是A.t2℃时，a是饱和溶液，b是不饱和溶液B.将两份溶液降到t1℃时，a、b中都有晶体析出C.要将b变成a，可保持温度不变向b中加入M直到溶液饱和D.M可能是熟石灰