电伤是指电流的（）对人体的伤害。
A.热效应
B.化学效应
C.机械效应
参考答案：A
学习迁移是指一种学习对另一种学的影响。( )
Tere are a few books on the shelf. But only one of them is _______
A．worth to be read
B．worth being read
C．well worth reading
D．worth read
