請依下文回答第 46 題至第 50 題：
The feeling that clouds and rain seem more likely to occur on weekends may be more than just a myth. Weekend
weather does differ from weekday weather in certain places, according to researchers who studied more than 40 years
of daily temperature readings from 10,000 weather stations worldwide. In their study, the researchers focused on
temperature differences between daytime highs and nighttime lows. This difference measurement is called the diurnal
temperature range, or DTR.
Part of the study involved 660 weather stations in the continental United States. At more than 230 of these sites,
the researchers found that the average DTR for Saturday, Sunday, and Monday was different from the average DTR for
Wednesday, Thursday, and Friday. Although the difference was small—only several tenths of a Celsius degree, the
pattern was striking enough to make the scientists take notice. That is, the DTR changes on a 7-day cycle.
This sort of weekly rise and fall doesn’t line up with any natural cycles, the researchers say. Instead, it is the
human activities—possibly air pollution caused by those activities—that are responsible for these weather effects. For
example, tiny particles in the polluted air could effect the amount of cloud cover, which would in turn affect daily
temperatures. Accordingly, tiny windborne particles from the western part of the United States, generated on weekdays,
might first affect weather close to home in the southwest, and then later influence mid-western weather. So, stop
feeling like the weekend weather is out to get us. It simply has a lot do with which way the wind blows and where it
comes from. 【題組】48 In what way can the finding of the research be considered important?
(A)It helps us better understand what DTR means.
(B)It provides evidence of human impact on climate.
(C)It shows how mysterious natural cycles are.
(D)It explains why temperature drops when night comes.
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