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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】Every year more than half a million American kids have drainage(排泄) tubes surgically implanted in their ears to combat persistent infections. The procedure, known as tympanostomy, may not be as (62) a...
A.
[A] feeling [C] health
B.
[B] hearing [D] memory
【单选题】Section BDirections: There are 2 passages in this section．Each passage is followed by some questions or unfinished statements．For each of them there are four choices marked A, B, C and D．You should de...
A.
could not easily be absorbed by the human body
B.
were potentially harmful to people's health
C.
were too expensive for daily consumption
D.
could not provide any cure for vitamin deficiencies
【单选题】下列有关排泄的说法正确的是
A.
肾脏疾病会使肾小球滤过率明显下降，对肾小管主动分泌和重吸收功能影响不大
B.
若肾清除率小于肾小球滤过率，说明可能有肾小管分泌
C.
改变尿液的pH，主要会使肾重吸收发生变化
D.
肾小管重吸收只有被动扩散过程
E.
汗腺排泄和肾排泄是药物最主要的两条排泄途径
【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