—It’s only ten minutes’ walk; I could have got there on foot. — Yes. A taxi _______ not at all necessary. A. was B. had been C.has been D. is 答案:A 解析: 略小明同学在用天平测物体质量的实验中,首先取来托盘天平放在水平桌面上,出现了如图(甲)所示的情况.(1)他应采取的措施是______;(2)天平调节平衡后,小明按图(乙)所示的方法来称量物体的质量,请你指出他在操作时犯的两个错误是:①______,②______.