问答题

According to the author, the essential thing to do in order to keep a strong          and healthy body is ____________.
A、 to build up good habits
B、  to increase resiliency of strong bones
C、to do excessive work and recreation
D、 to conform to standards of beauty



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单项选择题

下列哪项能传递化学信息?()

A.桥粒
B.半桥粒
C.质膜内褶
D.缝隙连接
E.紧密连接