____ ____ ____ lunch. Let's go to the dining hall.
-- Why don't we take a little break?
-- Didn't we just have_____?
甲、乙两种物质的溶解度曲线如图所示,下列说法正确的是( )
节肢动物的主要特征是:体表有坚韧的____;身体和附肢都____.
I'm t____.I need to drink some water.
下图为伏尔加河主要流经地区示意图。完成下列各题。