混凝土坝的外部和内部温度变化，（）引起混凝土的体积变化。A、不会； B、可能； C、

I was ten when I first sat with my grandmother behind the cashier(收银台)in her general store. 　 小题1:　I quickly learned the importance of treating customers politely and saying “thank you”.

At first I was paid in candy. 　 小题2:　I worked every day after school, and during the summer and on weekends and holidays from 8 a. m. to 7 p. m. . My father helped me set up a bank account. 　 小题3: 

By the time I was 12, My grandmother thought I had done such a good job that she promoted me to selling cosmetics(化妆品). I developed the ability to look customers directly in the eye. Even though I was just a kid, women would ask me such things as “What color do you think I should wear? ”I took a real interest in their questions and was able to translate what they wanted into makeup(化妆)ideas. 小题4: 

The job taught me a valuable lesson: to be a successful salesperson, you didn’t need to be a rocket scientist—you needed to be a great listener. 　 小题5:　Expect they are no longer women purchasing cosmetics from me; instead, they are kids who tell me which toys they would like to see designed and developed.

A．Later I received 50 cents an hour.

B．Before long, she let me sit there by myself.

C．I ended my selling a record amount of cosmetics.

D．Today I still carry that lesson with me: I listen to customers.E. My grandma’s trust taught me how to handle responsibility.

F. Soon I found myself looking more beautiful than ever before.

G. Watching my money grow was more rewarding than anything I could have bought.

某同学用伏安法测小灯泡的电阻时，误将电流表和电压表接成如图所示的电路．接通电源后，可能出现的情况是（    ）

A．电流表烧坏

B．电压表烧坏

C．小灯泡烧坏

D．小灯泡不亮

腰椎间盘突出症与腰椎管狭窄症临床症状的主要不同之处在于（）

A.腰痛及下肢放射痛的程度

B.有无鞍区感觉障碍

C.双下肢无力的情况

D.有无间歇性跛行

E.二便是否障碍

下列对主动脉的叙述哪项是错误的

A．起始部为升主动脉

B．从主动脉分出右颈总动脉、头臂干

C．起自左心室

D．腹主动脉是其末端

E．主动脉弓连接升主动脉与降主动脉

12sh—9A中sh表示（）

A.单级

B.双级

C.单吸

D.双吸