题目

At first, the students discussed the questions all in English, but after a while,        they ______speaking in Chinese.        A. gave up     B. picked up        C. turned up      D. ended up 答案：D如图是小明同学在探究“电阻上的电流跟电压的关系”时未连接成的实验电路，请你帮助他完成电路图的连接．