There are too _____ fish and too _____ water in the sea. [ ]

A. much, much

B. much, many

C. many, much

D. many, many

泌尿系结石最常见的类型为( )。

A．尿酸结石
B．胱氨酸结石
C．草酸盐结石
D．磷酸钙结石
E．感染性结石