总角之宴

今义：宴会          古义：____

如图所示是研究电流与电压、电阻的关系的电路图．实验分“保持电阻不变”和“保持电压不变”两步进行，在“保持电阻不变”这一步实验时应（　　）

    John usually goes to school by bus. He leaves (离开)his house at seven and gets to school at about seven twenty. His school is on the hill.

    From Monday to Friday John usually has four classes every day. He likes English. He wants to be an English teacher. He hopes he will go to the USA to study English one day. On Sundays, he often goes to the library with his friends, but sometimes they go to see movies.