在图画出物体AB在平面镜中的像A’B’。(3分)
图略
分别作出物体AB端点A、B关于平面镜的对称点A′、B′,用虚线连接A′、B′即为AB在平面镜中的像。
单词拼写(共10小题;每小题1分,满分10分)
小题1:I have no idea of the ___________(平均) size of classes in the UK.
小题2:Great changes have taken place in our country ___________(近来).
小题3:Good ________(准备) should be made before we have the important meeting.
小题4:Don’t feel e__________ about being different from others.
小题5:I would p________ playing outdoors to watching TV at home.
小题6:__________ (注意力集中) more on your work or you will be fired.
小题7:I found it difficult to keep my b________ on the icy road.
小题8:She performed the most c_________ task without a mistake.
小题9:I’m learning German, but I still can’t speak it p_________.
小题10:Children should be encouraged to be i____________ thinkers.
细胞的生物电现象中,“构成动作电位主要部分的脉冲样变化”是指()
A.锋电位
B.后电位
C.动作电位
D.负后电位
E.正后电位