资产证券化的作用在于( )。

A．提高商业银行资产的流动性
B．增强商业银行关于资产和负债管理的自主性
C．是一种风险转移的风险管理方法
D．以上都正确

A variety of games, role-plays, simulations, etc. are ______ communicative activities prepared to support the Communicative Language Teaching.

A. text-based



B. task-based
C. game-based



D. situation-based