单项选择题

From the passage, we know that ______.

A．the brain begins processing and storing memories just before it's time for bed
B．parts of the brain that we have not used to learn become active again during sleep
C．the processing continues only when they're thinking about or doing other things.
D．each task requires different parts of the brain to learn.
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单项选择题
Which of the following statements is true according to the passage
A．Weekday weather has a lot do with which way the wind blows and where it comes from.
B．Though the DTR indifference was small, the pattern was worth of the scientists' attention.
C．Possibly air pollution from natural activities should be blamed for the weather changes.
D．Tiny particles in the air of cloud cover and indeed could affect daily temperatures,
单项选择题
The first paragraph suggests that ______.
A．weekend weather differs from weekday weather in certain places
B．temperature ranges were typically broader on weekends
C．human activities should be blamed for the changing weather
D．tiny windborne particles might first affect weather
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