A.generate more income
B.expand their businesses
C.undertake their duties for the society
D.demonstrate their actual strength
A.Concerned.
B.Indifferent.
C.Irritated.
D.Shocked.
A.there is little for astronomers to discover now
B.the public has no interest in astronomical discoveries
C.astronomers have been making a lot of discoveries of planets
D.the discovery of planets is as important as the launch of space shuttles
A.Because scientists cannot figure out what they can be.
B.Because astronomers have never seen similar orbiting pattern and size before.
C.Because the planets are very huge.
D.Because the planets are far from our solar system.