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