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
Rabin announced new security measures on television ______.
A．after an emergency session of his inner security cabinet
B．before the emergency meeting
C．after two Arabs were shot dead
D．before two Israeli policemen were killed
单项选择题
Which of the following is the highest form of literary expression
A．Prose.
B．Poetry.
C．Novel.
D．Speech.
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