题目

The surface of Mars is ______like the surface of Earth than_____ planet in our solar system (太阳系)． A． much; the other  B． much; any other  C． more; the other  D． more; any other 答案：D如图是研究杠杆平衡条件的实验装置，要使杠杆在水平位置平衡，B处应挂与A处同样大小的钩码个数为(    ) A．6个             B．4个              C．3个              D．2个