—Usually at Lantern Festival.
A:when do people eat
B:how do people eat
C:when people eat
D:how people eat
如图所示是探究“凸透镜成像规律”的实验装置:
甲国伊塞克湖属于内陆咸水湖,湖面平均海拔约1608米,面积6300多平方千米,最深处达668米,是世界第二大高山深水湖泊,湖水清澈澄碧,终年不冻。有“热湖”之称。读下图完成下列各题。