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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】缝隙连接的主要机能是
A.
防止大分子物质通过上皮细胞向细胞间扩散
B.
加强细胞间的连接
C.
防止体内组织液丢失
D.
扩大细胞的表面积
E.
有利于细胞间 之间传递生物电 冲动
【单选题】Imagine a world in which there was suddenly no emotion—a world in which human beings could feel no love or happiness, no terror or hate. Try to imagine the consequences of such a transformation. Peopl...
A.
they would not be able to tell the texture of objects
B.
they would not know what was beneficial and what was harmful to them
C.
they would not be happy with a life without love
D.
they would do things that hurt each other's feelings
【单选题】消化系统的主要机能?
A.
消化、吸收营养物质，并将残渣排出体外
B.
与外界进行气体交换
C.
机体的重要排泄系统，并具有内分泌功能，可对某些生理功能产生调节
D.
繁殖后代，并分泌激素维持动物第二性征