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江苏省盐城中学10-11学年高一第一学期期中考试（英语）.doc   What exactly is a lie ?Is it anything we say which we know is untrue ?Or is it something more than that ?For example, suppose a friend wants to borrow some money from you. You say “I wish I could help you, but I am short of money myself.” In fact , you are not short of money but your friend is in the habit of not paying his debts and you don’t want to hurt his feelings by reminding him of this. Is this really a lie ? Professor Jerald Jellison of the University of southern California has made a scientific s1．一起重机通过一轻绳将货物向上吊起的过程中（忽略绳子的重力和空气阻力），以下说法正确的是（　　）A．当货物匀速上升时，绳子对货物的拉力与货物对绳子的拉力是一对平衡力B．无论货物怎么上升，绳子对货物的拉力大小都等于货物对绳子的拉力大小C．当货物减速上升时，绳子对货物的拉力大小一定大于货物的重力大小，此时货物处于失重状态D．当货物加速上升时，绳子对货物的拉力大小一定大于货物的重力大小，此时货物处于超重状态