-- _________?
--It's B.
A：Where's B
B：What's your name
C：What's this in English?
--I think it's really necessary. It is reported that the food that Chinese people
every year is enough to feed 200 million people for a year.
关于如图所示电与磁部分四幅图的分析，其中正确的是（ ）
商周时期，手工业技术已达到相当高的水平，其中最具代表性的是（ ）
