问题
选择题
---How amazing it is that astronauts are exploring outer space!
----- It’s a challenge, I guess, man against nature.
A.of
B.for
C.by
D.about
答案
答案:A
考查介词。应答句中的I guess是插入语,因此所填介词与challenge连用,表所属,用of,选A。