题目

用线将吊灯悬挂在天花板上，下列属于平衡力的是（） A . 线对灯的拉力和灯对线的拉力 B . 灯受的重力和线对灯的拉力 C . 天花板对线的拉力和线对灯的拉力 D . 线对天花板的拉力和天花板对线的拉力 答案：B1.I’m 9 years old, and she is 9 years old, too.We_______ _______9 years old.2.Ella is as tall as Joe.Ella has________ _______height as Joe.3.My favorite subject is English.I like English________than_______other subject.4.Rita is much taller than Li Mei.Li Mei is much________ _________Rita.5.This bike is cheaper than that one.That bike_______as_______as this one.