单项选择题

As far as can be gathered from the passage, which of the following best describes the man's wife

A．Understanding.
B．Jealous.
C．Practical.
D．Artisti
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单项选择题
Which of the following causes the outside layer of the star to be blown away from the core
A．Shock waves.
B．The iron core collapse.
C．Blast wave.
D．The fusing of carbon and oxygen.
单项选择题
What does the passage mainly discuss
A．Nuclear fusion in supernovae.
B．Defining a supernova.
C．The process of the death of stars.
D．Gravitational force and its effects on supernova
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