细胞膜上与细胞的识别、免疫反应、信息传递和血型决定有着密切关系的化学物质是[ ]
A．糖蛋白
B．磷脂
C．脂肪
D．核酸
答案：A
以下哪个脏器不位于腹膜后（）。
A.肾上腺
B.肾
C.肝
D.胰腺
He asked several questions_______ the professor who gave us a lecture_______the balance of nature.
A．with; for
B．from; of
C．to; about
D．of; on
