【单选题】Of all the problems facing modern astronomers, perhaps the most fascinating is: 'Can intelligent life exist elsewhere?' Since the Earth is an unimportant planet moving round an unimportant star, it wo...
A.
there may be other intelligent beings in the universe
B.
there are other intelligent beings in the universe
C.
people living on the earth are almost certainly the only intelligent beings in the universe
D.
people living on the earth are definitely the only intelligent beings in the universe