pH玻璃电极对样本溶液pH的敏感程度取决于（）

A.电极的内充液

B.电极的内参比电极

C.电极外部溶液

D.电极的玻璃膜

E.电极外部溶液的pH值

Leaves are found on all kinds of trees, but they differ greatly __ size and shape.

A．on

B．from

C．by

D．in