—I have some big news for you. You've been accepted as a member of our club.

—_______ That's great![ ]

A. Have I?

B. Pardon?

C. Congratulations!

D. Good idea!

(3分)甲、乙、丙三种固体物质的溶解度曲线如下图所示。

(1)30℃时，丙的溶解度是              。                                         

(2) 5℃时，取甲、乙、丙三种固体物质各20g分别加入盛有lO0g水的烧杯中，充分搅拌后得到的溶液，能够饱和的是         物质的溶液。又将三个烧杯中的混合物温度都升高到30℃，所得溶液溶质质量分数的大小关系是                    。