A:a worse day
B:a nicer day
C:such bad a day
D:so fine a day
鲫鱼游泳时,前进的动力主要来自( )
-- ______. Is it five o'clock now?
-- ______, I don't know.
在括号里填上合适的词语。
____勃勃 丰富____
____无虑 粗细____