选择恰当的句子补全下面的对话。

A: Hi, Jim. ____

B: I get up at 6:30. ____

A: Usually at 6:00. ____

B: I often wash my clothes and clean the windows.

A: Wow! ____

B: Do you do housework (家务活), too?

A: Yes, sometimes. ____

B: Sounds interesting!

A. You're so hard-working.

B. When do you get up on Saturdays?

C. What do you do on the weekend?

D. But I often play computer games.

E. What about you?

赵强同学学了物理之后，养成了观察生活的好习惯，他发现好多药瓶的瓶盖的侧面都做有密集的竖条纹，如图所示，其目的是为了                   (    )

观察下图——向“距离”挑战。结合所学知识判断，下列叙述正确的是（    ）

过去万源交通不便物质运输全靠人力，“巴山背二哥”是人们对当时背运货物的人的俗称，每当“背二哥”登上一座山时总要高歌一曲，这里的“高”指____ ，日久天长“背二哥”都练成了男高音，这里的“高”指____ ．