单项选择题

We learn from this passage that

A．the sun is the heaviest star in the universe.
B．a star in the sky might have an invisible partner.
C．two black holes are dragged towards each other.
D．the mass of a star is equal to that of its companion.

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热门试题

单项选择题

Which of the following is NOT mentioned as an example involving nonverbal thinking in paragraphs 1 and 2

A．Building cathedrals.
B．Creating rockets.
C．Designing diesel engines.
D．Making boats.

单项选择题

Which of the following does NOT fit the definition of the black hole

A．The black hole is a region of space.
B．The black hole sucks in any object that passes by it.
C．The black hole is visible through an infrared telescope.
D．The black hole has no matter.