在技能的形成过程中，其进步情况的表示方法是用( )
A．图示
B．坐标
C．遗忘曲线
D．练习曲线
参考答案：D
He feels it dangerous for a girl to be out late at night, so he won’t have his daughter _______ home late.
A．arrive
B．arriving
C．toarrive
D．arrived
减温器的型式有哪些？各有何特点？
