单项选择题

How many times is the indoor air more hazardous than the outdoor air

A．10 to 12.
B．12.
C．2 to 10.
D．2.
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单项选择题
Of studies was written by ______.
A．John Bunyan.
B．John Donne.
C．Francis Bacon.
D．William Blake.
单项选择题
What does Christmas commemorate
A．The coming of a new year.
B．The death of Jesus Christ.
C．The birth of Jesus Christ.
D．The crucifixion and resurrection of Jesus Christ.
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