如图，站在运行中的自动扶梯上的顾客，常觉得自己是静止的，他选择的参照物是（　　）

    Hello！My name is Jim. I am from England. But now I'm in Guangdong, China. I am in 1 I'm in No. 5Middle School. The weather here is 2 in summer. I often swim in the river in the afternoon. I like swimming 3.4is good for us. I like playing football,5 I can play football very well. After school I play 6 with my classmates. And I often 7 football games on TV. My friend, Kitty, is from the US.  She8 singing very much. She can sing very well. We all like listening to9songs. In music class she often sings songs. Our 10 teacher likes her very much. She says Kitty can be a good singer in the future.

       A hot dog is one of the most popular American food. It was named after frankfurter, a German food. You may hear “hot dog”1in other ways. People sometimes 2“hot dog” to express pleasure(快乐). For example, a friend may ask 3 you would like to go to the cinema. You might say, “Great. I’d love to. ” Or, you could say,”4! I'd love to go.” People 5use the expression to describe someone who is a “show-off”, who tries to show everyone else how 6he is. You often hear such a(n)7called a “hot dog”. He may be a basketball player, for example, who 8the ball with one hand making a(n) 9 catch seem more difficult. You know he is a “hot dog” because when he makes such a catch, he bows(鞠躬) to crowd, hoping to10their cheers.