The entry point tissue in the very front of eye functions as the window ______ all light has to pass on its way.

A．which

B．that

C．across which

D．through which

（）的宗旨是公正、尊重人格、力求使受试者最大程度受益和尽可能避免伤害（）

A.《世界医学大会赫尔辛基宣言》

B.GCP

C.GAP

D.GLP

E.药学伦理学