(单选题)

According to the National Weather Service ( ).

A.the cool mass of air originates from Canada

B.a mass of cold air will affect both

C.nada and the
U.S
C. the chilly weather is back to the globe

D.only the upper Midwest will be affected by the cool air

参考答案：A

参考解析：

细节题。根据文段提到的“A cool mass of air heads toward the United States from the upper regions of Canada and Alaska this week according to the National Weather Service”。我们从这句当中可以知道，在加拿大和阿拉斯加地区形成的冷空气大规模的向美国行进。可知A项符合。B项指的冷空气会同时影响加拿大和美国。C项寒流天气会重来。D项仅仅是海拔较高的中部地区会受寒潮的影响。BCD项均不符文意。因此答案选A。

知识点：细节题英语阅读理解通用英语