--- Are you willing to live on Mars(火星) one day? It must be amazing! --- It sounds exciting, but it still worries me.
A．Of course I am.
B．I’m not sure.
C．Why not?
D．Are you telling a joke?
答案：B
试题分析：句意：--有一天你愿意在火星上住吗?—我不确定，听起来很刺激，但是它仍然使我很担心。A. Of course I am. 当然是； B. I’m not sure. 我不确定； C. Why not? 为什么不呢? D. Are you joking?你在开玩笑吗?根据It sounds exciting,but it still worries me.故选B。 考点：考查交际用语