单项选择题
A．在这项实验巾，他们在晚上几次被叫醒，被要求汇报他们刚才正在做什么样的梦。 B．在这个实验中，他们在夜里几次被叫醒，要求讲出他们刚才梦见的是什么。 C．在这次实验中，他们几次被叫醒，要求讲出他们在晚上梦见的是什么。 D．在这个实验中，他们一晚上醒了好几次，相互询问梦见了些什么。
A．try to please their students B．treat their' students as consumers C．understand their students well D．make sure their students understand
A．how well they perform in class B．how carefully they prepare their lessons C．how fluently they express themselves in class D．how hard they work before and in class