单项选择题

A．Because she thinks the man is seriously ill.
B．Because the man can get immunized there for free.
C．Because all the service is free of charge in the university health center.
D．Because the vaccine has been invented there recently.
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threatened
单项选择题
A．It may easily go wrong and any unsaved work disappears.B．It crashes the computer easily.C．It may attract the thunder.D．It consumes more power.
A．It may easily go wrong and any unsaved work disappears.
B．It crashes the computer easily.
C．It may attract the thunder.
D．It consumes more power.
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