______, I have to put the book away and focus my attention on study this weekend. [ ]

A. However the story is amusing

B. No matter how amusing is the story

C. However amusing is the story

D. No matter how amusing the story is

在中国餐饮发展为一个独立的行业是在（）。

A、原始社会

B、秦汉时期

C、商周时期

D、唐宋时期