阅读短文，选择五个选项还原到短文中。（每小题2分）
I’d like to tell you something about my pet cat. 小题1: It was black and white. When I saw it, I wanted to take it home. I gave it a name “ Tail” because its tail(尾巴)was very long. After a few days, I thought it was a trouble for me, but I didn’t want to give it back. 小题2:
Maybe because the cat was a male(雄性), it was noisy and very good at doing bad things. 小题3: It sometimes jumped on to the mosquito net(蚊帐) and played at night. It never listened to my words, but it was very afraid of my dog “ Mandy”. 小题4:. When it happened so, my housekeeper had to look for it everywhere. Sometimes the cat hid(躲) under the chair. Once the door was opened, it ran out of the room quickly.
Now, it is getting along well with my pet dog. 小题5: Though it always does bad things, I love it.
A．It got lost on its way home.
B．I got it from my cousin last month.
C．Sometimes I didn’t see it two or three hours.
D．I decided to wait and see for two or three days.E. It always carried small things rolling(原地打转)
F. I like the dog better than the cat.
G. It plays and sleeps with the dog.
和
间的距离为
，现在
=0时
，反向值也为
的带正电且电荷量为
的粒子组成的粒子束，从
的中点
以平行于金属板方向
的速度
不断射入，所有粒子不会撞到金属板且在
，不计重力影响。试求：
点的距离范围；