单项选择题

Which of the following is the sign of a storm（）

A．A sudden and warm wind.
B．Thick and lower clouds.
C．Small and feathery cirrus clouds.
D．Dark and thunder clouds.

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According to the first paragraph, we can say that （）

A．the weather always remains the same in a day
B．a fine day can't last for long
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D．the weather changes a lot
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Only the （） will bite for blood.

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