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
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.
单项选择题
From the news item, we can see that Newsweek magazine retracted its report because________.
A．Bush administration had pressured it to
B．the interrogators had already apologized
C．the report leaded to unexpected reactions
D．the report was invented by a reporter
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