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Do you have any skiing equipment you no longer need? A ski school in the far north of India could put it to good use. In March we published a photo story about the extraordinary Zsnskar region in northern India，which is cut off from the outside world for more than seven months of the year，and only accessible (可通行的)via a frozen river．We also included information about the limited use of skiing in the region and the recent creation of the Zanskar Ski School: “Despite the difficulties of travelling through the region when the snow comes，skiing hasn’t traditionally been 如图所示是甲、乙、丙三种物质的溶解度曲线，在20℃时，分别取等质量的三种物质的饱和溶液放入三只烧杯中，然后向溶液分别加入等质量的相应固体物质，再将温度升高到40℃，结果甲物质全部溶解，丙物质部分溶解，试回答下列问题：（1）乙物质的溶解情况是______．（2）依次写出甲、乙、丙三种物质的溶解度曲线的序号：______；（3）当温度在20℃～30℃时，三种物质的溶解度由大到小的顺序是______；（用甲、乙、丙填空）（4）40℃时，等质量饱和溶液中含水最少的是______物质．（5）40℃时，甲溶液中溶质质量分数______大于丙溶液中溶质质量分数；（填“一定”或“不一定”）．