单项选择题

According to Einstein's theory, objects in the area of a black hole

A．are gathered in its center.
B．strike against one another frequently.
C．do not have absolute space.
D．are relatively brighter.
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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.
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.
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