——Mum, may I have some cakes?—— Sorry, there's ________left . I'll go and buy some for you tonight.
A:nothing
B:no one
C:no
D:none
当莴笋等植物的茎被折断时,从茎的断面上流出白色的汁液,流出该汁液的结构是____ .
如果说人的情绪是奔腾的“洪水”,那么,理智就像一道坚固的“闸门”。这句话表明( )