A:肺
B:鳃
C:口腔
D:鼻
— How can I stay in shape?
— A well-balanced diet together with regular exercise ______ you'll make it.
当内环境的稳态遭到破坏时,必将引起 ( )
某烯烃A能发生如下图所示的转化:
试回答下列问题: