—You don’t believe in aliens, do you ?

—__________. It’s a crazy idea.________

A．Yes, I do; I don’t believe a word of it.

B．Yes, I do; You’ve got it right.

C．Yes, I don’t; You must be joking.

D．No, I don’t; What do you make of it?

一般保证的保证人与债权人未约定保证期间的，保证期间为主债务履行期届满之日起（）。

A.六个月

B.四个月

C.二个月

D.八个月