在我们学习一项新的技能时，往往在达到一定层次后，再想要进一步提升学习成绩会变得非常困难，仿佛学习停滞不前了，即使继续努力也收效不大，这种现象叫做：
A.高峰体验
B.高原效应
C.学习疲劳
D.天花板效应
正确答案：B
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