The clever boy made a hole in the wall, _______ he could see _____ was going on inside house.

A．which; what

B．through which; what

C．through that; what

D．what; that

下列激素的血液浓度随进食而明显改变的是 （）

A.胰岛素

B.FSH

C.生长激素

D.甲状腺素

E.雌二醇