----What’s it that cost him the job?

----_______ experience .He was always very nervous.

A．Lacked

B．Being lacked

C．Lacking

D．To be lacked

人体内属于可逆反应的是（）。

A.异柠檬酸－α-酮戊二酸

B.草酰乙酸－柠檬酸

C.α-酮戊二酸－琥珀酰

D.磷酸烯醇式丙酮酸－丙酮酸

E.葡萄糖－6-磷酸葡萄糖