演示技能的应用原则与要点是什么
参考答案：(1) 针对性和目的性；(2) 适用性和鲜明性；(3) 示范性和可靠性；(4) 演示与讲授统一性。
The question occurred to me ______ we were to get the machine needed.
A．that
B．what
C．why
D．where
异地高考的外延要比高考移民的外延小。
