水体富营养化的征兆是（）的大量出现。
A.绿藻
B.蓝藻
C.硅藻
D.鱼类
参考答案：B
-- This term I want to be the top student in my class.
--_________.
A．Thank you
B．Never mind
C．Of course
D．Good luck to you
I know a place________we can have a big meal.
A．that
B．where
C．which
D．what
