单项选择题

What is the most dangerous thing about nitrous oxides

A．Stagnant air.
B．Damage to concrete.
C．Unfounded fears.
D．Potential carcinogenic effects.
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单项选择题
This year’’s federal budget deficit will be________.
A．$442 billion
B．$56 billion
C．$2.3 trillion
D．$3.6 trillion
单项选择题
Where is the train to Nanjing now standing
A．At Platform 7.
B．At Platform 8.
C．At Platform 9.
D．At Platform 13.
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