题目

注射器的针头做得很尖，其目的是为了增大________；学校国旗杆的顶部通常安有一个定滑轮，其目的是改变力的＿＿＿＿＿＿。  答案：解析:略 ______I know him, ______I hardly talk to him. A．Although; but B．Although; / C．/; Although D．But; although