单项选择题

单烯烃的通式是( )

A．CnH2n+2
B．CnH2n
C．CnH2n-2
D．C2nHn

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多项选择题

除了数数以外，集合比较的策略还有哪些？（）
A、目测
B、视觉提示
C、一一对应
D、瞎猜

单项选择题

A______refers to a variety of language that serves as a medium of communication among groups of people for diverse linguistic backgrounds.
A、lingual franca
B、register
C、code
D、national language