Hello! My name is Becky Sharp. I’m 11 years old. I have one brother. His name’s Jason and he’s 14. I don’t have any sisters.
We live with our mum, dad and grandma in a small house in Chesterfield, in the north of England. There are lots of things to do here. My friends and I sometimes go to the cinema on Saturdays.
Do you like sport? I like football. My favorite team is Manchester United. I sometimes play football with my brother. I am good at it but my brother isn’t.
I have lots of pets---one tortoise (乌龟) and six goldfish (金鱼). I want a dog or cat, but my mother doesn’t like them.
小题1:There are ________ people in Becky’s family.
A．three
B．four
C．five
D．six小题2:Becky and her family live in________.
A．a big room
B．a cinema
C．the west of England
D．a small house小题3:Does Becky play football well?________
A．Yes, she does.
B．No, she doesn’t.
C．She is not very good.
D．We don’t know.小题4:Becky’s mother doesn’t like________.
A．tortoises or goldfish
B．tortoises or dogs
C．dogs or cats
D．goldfish or cats小题5:What does pet mean in Chinese?
A．朋友
B．宠物
C．玩具
D．同伴
、体积
的重物捆绑在开口朝下的浮筒上。向浮筒内冲入一定质量的气体，开始时筒内液面到水面的距离
，筒内气体体积
。在拉力作用下浮筒缓慢上升，当筒内液面的距离为
时，拉力减为零，此时气体体积为
，随后浮筒和重物自动上浮。求
，水的密度
，重力加速度的大小
。不计水温变化，筒内气体质量不变且可视为理想气体，浮筒质量和筒壁厚度可忽略。