--- I’m afraid it’s going to rain this afternoon.

--- ______ Look at the dark and cloudy sky.

A．Not really.

B．Is it?

C．Why not?

D．I guess so.

多发性硬化最常见的临床表现是（）

A.复发-缓解型

B.继发进展型

C.原发进展型

D.进展复发型

E.良性型