单项选择题

The first A3XX will be available in 2003.

A． Right
B． Wrong
C． Not mentioned
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单项选择题
What leads to the formation of a black hole
A．The structure of a star.
B．A collision between two stars.
C．The attraction of two large stars.
D．The shrinking of a large star by its own gravitational force.
单项选择题
Why does the author put neutron star in quotation marks
A．It is a special term of astronomy.
B．It is an invented term.
C．He is quoting an authority.
D．He is using the term ironically.
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