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We never thought we'd say this, but we'd welcome back some chilly weather. 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. According to the NWS, a mass of cold air will drop from the Arctic regions to Canada and then the upper Midwest next week. Temperatures across the Midwest will drop into the 60s and 70s—a sharp difference from the 80 degree and 90 degree temperatures from recent weeks. And the relatively cooler air may be felt as far East as New York and Washington. The cool breezes may be a welcome relief this time around, but remember the last few times we got hit with Arctic air? Temperatures in cities including Chicago, Cleveland, New York, and Louisville fell into single-digit and negative territory for long stretches during the harsh winter months of early 2014. But we're sure you remember.

单选题 According to the National Weather Service, ___.

the cool mass of air originates from Canada

a mass of cold air will affect both Canada and the U.S.

the chilly weather is back to the globe

only the upper Midwest will be affected by the cool air

正确答案：B

解析

本题考查细节理解。关键词：the National Weather Service 主题句：第2段：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. 根据国家气象局预测，本周一股冷空气将从北部的加拿大和阿拉斯加直驱进入美国。题目意为“跟据国家气象中心，？” A项“冷空气源于加拿大”；B项“一股冷空气将影响加拿大和美国”；C项“全球进入寒冷天气”；D项“只有高纬度中西部将被冷空气影响”。根据主题句，B项符合题意，应当选。故本题答案为B项。