— Excuse me, where is the post office?

— ______ of the road. [ ]

A. At the end

B. In the end

C. On the end

D. To the end

胆酸在肠道细菌作用下可转变为

A．鹅脱氧胆酸

B．脱氧胆酸

C．石胆酸

D．甘氨胆酸