A．Men usually like to eat more hamburgers than women do in France.

B．Men, more likely to be working behind a jackhammer, need to eat so much.

C．Women make up almost half the labor force in France now.

D．Women have to pick up the children late from the day-care center.

我国目前对劳动合同鉴证实行（ ）

A．强制鉴证

B．自愿鉴证

C．选择鉴证

D．指定鉴证