The company had to______a number of workers because of the drop in sales.

A．see off

B．take off

C．cut off

D．lay off

α-苯乙醇和β-苯乙醇可以通过下列哪种方法（或试剂）来鉴别？（）

A.碘仿反应

B.金属钠

C.托伦斯试剂

D.浓HI