“研究开发中学”可以分为连续循环的（）等阶段。
A.沉思的观察
B.抽象的概念化
C.具体的体验
D.积极的实验
参考答案：A, B, C, D
在探究人耳怎样听到声音时，可以用肥皂膜模拟人耳的鼓膜。如图所示，当喇叭发声时，肥皂膜将
A．振动
B．一直向左运动
C．一直向右运动
D．静止不动
—What are you going to do next year?
—______. [ ]
A. I was thinking of it
B. I have decided to be a singer
C. I studied in Peking University
D. I'm not sure. Maybe I will study abroad
