---He suggests the number of cars should be limited to stop air pollution.

--- __________, the idea is not very practical.

A． As good it sounds

B．Good as it sounds

C．Sounds good as it

D．As it sounds good

在委托代理中，代理人有代理权的依据是( )。

A．委托合同和授权
B．委托合同或者授权
C．委托合同
D．授权