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
What did the speak want to tell us in this passage
A．One can benefit a lot from working with his father.
B．Manual laborers shouldn’’t be looked down upon.
C．One should always do his job earnestly.
D．Teenagers tended to be careless.
单项选择题
According to the weather report, the pollution index was________.
A．very good
B．good
C．fair
D．poor
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