单项选择题

Why did Nick and Doug fail to move up the piano to the house

A．The floor is slick.
B．The staircase is tilted.
C．The passage is narrow.
D．The tread is unsteady.
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单项选择题
According to the weather expert’s prediction，what will make the atmosphere warmer
A．Releasing less and less carbon dioxide.
B．Continuing to burn fuels at the present rate.
C．Melting of ice caps in the poles.
D．The rising sea level several meters.
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