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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 Canada 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

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。