-I drove to Zhuhai for the air show last week.

-Is that __you had a few days, off?

     [ ]

A. where      

B. what        

C. whether    

D. why

不参加脂肪酸β氧化的酶是（）。

A．脂酰CoA脱氢酶

B．烯脂酰CoA水化酶

C．β酮酰CoA硫解酶

D．β酮酰CoA转移酶

E．β羟脂酰CoA脱氢酶