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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单项选择题

Which of the following can be the best title for this article

A．Daytime Highs and Nighttime Lows.
B．The Average DTR Was Different.
C．Weekend Weather Really Is Different.
D．There's Rain in The Forecast.

单项选择题

It can be concluded that ______.

A．the sky always turns gray only on weekends.
B．in the Midwest, weekdays saw larger daily temperature variations sometimes.
C．this difference measurement is called DTR, meaning the daytime temperature range.
D．part of the study involved 660 weather stations only in the United Nation.