Questions 1-4According to the talk, what i
题型：单项选择题
问题：
Questions 1-4
According to the talk, what is a plateau？（）
A．A temporary condition where you don’t feel any progress in learning.
B．A flat and smooth spot in your study where you make fewer mistakes.
C．A long-term struggle which does not bring you any tangible rewards.
D．An educational research on language learning that is unusual and advanced.