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
According to the woman, what causes most of the damage to the air
A．Industrial sources.
B．Automobiles.
C．Nitrogen sources.
D．Natural activities.
单项选择题
Which of the following statements is CORRECT
A．Boys and girls are equally energetic.
B．Parents have higher expectations for boys.
C．Some parents lack skills to deal with their kids.
D．Some parents are ill-educated and ill-tempered.
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