单项选择题

John ______ now for the light in his room is still on.

A、must study
B、must be studying
C、must have studied
D、would have studied

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单项选择题

In regarding to the three basic complex that establishing the apical basal polarity of epithelial cells, which of the following statements is correct?

A、The apical par complex is the master regulator that activates the crumbs complex and is inhibited by the scribble complex
B、The apical par complex is the master regulator that activates the crumbs complex and inhibits the scribble complex
C、the crumbs complex inhibits the Scribble complex and defies the basal and lateral surfaces
D、the scribble complex defies the basal and lateral surfaces and directly inhibits the crumbs complex

啤酒杀菌的目的是为了保证啤酒的生物稳定性，有利于长期保存（）

A.正确
B．错误

答案： A.正确啤酒杀菌是通过加热的方式杀死啤酒中的微生物，主要是酵母和细菌，以防止它们在啤酒储存过程中继续发酵或引起腐败。这样...