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.

证券是指用以证明或设定权利所做成的（），是指各类记载并代表一定权利的法律凭证。

A．资本凭证 

B．书面凭证 

C．货币凭证 

D．口头凭证