根据对话情景，填入恰当的单词。

L-Lisa, E-Edward

L: The last day of school finally comes. What are you doing on this summer vacation?

E: Well, from tomorrow on, I'm working as a __1__ in my dad's restaurant.

L: Really? So soon?

E: I really like to meet people and want to save some money for college.

L: Are you __2__  every day?

E: No. I'm not working on weekends.

L: What are you doing then?

E: I'm going to a friend's cabin (小屋) by the lake on most weekends. I like __3__ and water-skiing. It's

    great to stay in the water in summer.

L: Oh, that sounds like fun!

E: I'm going to __4__  with my cousin in the last week. We both like places of interest (名胜古迹).

L: Have a great time!

为六腑，又属奇恒之腑的内脏是（）。

A.胆

B.胃

C.膀胱

D.三焦

E.大肠