题目

如图，杠杆处于平衡状态，如果在杠杆两侧挂钩码处各增加一个质量相同的钩码，杠杆会（    ）A．左端下降   B．右端下降   C．仍然平衡   D．无法判断 答案：ALittle Tom admitted ______ in the examination, ______ the teacher his word that he wouldn’t do that again. A．to cheat; to giveB．cheating; kept C．having cheated; givingD．to have cheated; keeping