参考答案

正确答案：B
解析：作者在文章倒数第四段指出“．．．adultsandteens(withacold)oftendonotgetafever．Ontheotherhand，feverisoneofthecharacteristicfeaturesofthefluforallages．”故可根据B(Ahightemperature)来区分病人患的是感冒还是流感。