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
Tax collectors______
A．tried to collect more money than the ruler asked for
B．were given some silver and gold coins by the ruler
C．were excused from paying income tax
D．enjoyed being invited to dinner at the ruler’ s palace
单项选择题
What’s the US troop casualty
A．9.
B．40.
C．49.
D．125.
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