投机者在采取平均买低或平均卖高策略时，必须以对市场大势的看法不变为前提。（）
参考答案：对
The number of the students in our school now _____ that of ten years ago. Which of the following is wrong? [ ]
A. has doubled
B. is double
C. is twice as large as
D. is twice as much as
对学习过程中制定自我学习计划、实施自我监督以及自我调控的策略，一般称为( )
A．智力技能
B．学习自觉性
C．元认知策略
D．自我意识
