单项选择题

A．Energy only emits from Sagittarius A.B．There are many……

According to the passage, which of the following is TRUE

A．Energy only emits from Sagittarius A.
B．There are many strong energy sources.
C．Energy comes from a black hole.
D．Energy emits from any regions surrounding Sagittarius A.

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单项选择题According to the German researchers, the energy source at the center of the Milky Way Galaxy ______.

A．has been covered up by vast clouds of dust and gas
B．still remains unknown to astronomers
C．has proved to be a black hole
D．actually provides power for the rotation of file great spiral of stars