问答题
It can be inferred from the last paragraph of the passage that which of the following must be true of the Earth as it orbits the Sun?
A.Most meteor streams it encounters are more than 2,000 years old.
B.When passing through a meteor stream, it usually passes near to the stream’s center.
C.It crosses the Geminid meteor stream once every year.
D.It usually takes over a day to cross the actual Geminid meteor stream.
E.It accounts of msot of the gravitaitonal perturbation affecting the Geminid meteor stream.
A.Most
B.
B.When
C.
C.It
D.
D.It
E.
E.It
F.