Unlike many other boys of his age who are often addicted to PC games, he is _______ on outdoor activities in the mountains.

A．eager

B．starving

C．keen

D．fond

服务员通常在顾客所点菜肴酒水上齐后，即可清点酒水单、点心单、（）。

A.点菜单

B.帐单

C.餐具

D.服务清单