Long long ago, there ____ a king. He ____ new clothes very much. There ____ two ____.  They can make magic clothes. ____ people can see it. But foolish people can't. The king ____ through the city with new clothes. A lot of people looked at him and ____. A little boy ____ at the king and ____ "Ha! Ha! The king isn't ____ clothes!"

如图为我国长江、黄河、珠江和塔里木河的流量年变化曲线图，读图完成问题．
 
四条河流中流量最大和含沙量最大的分别是（ ）

如图所示，小芳在做“探究影响滑动摩擦力大小因素”的实验时，操作的错误是____。纠正错误后，应拉动弹簧测力计使木块做____运动。若在木块上再放一个砝码，则木块运动时受到的滑动摩擦力将____(填“变大”“变小”或“不变”)。