A:Why don’t you stay at the library?
B:I’ve been looking forward to it for ages.
C:Get dressed and hurry to work.
D:Let’s make the most of it.
如图的图形中只能用其中一部分平移可以得到的是( )
如果a的倒数是-1,那么a2013等于( )
吃饭时,大说大笑会呛着,是因为
如图为几种生物的结构示意图,请据图回答: