terriblly popular

答案D
分析：空格词修饰形容词cold,因此要用副词terribly(注意拼法).(延伸)注意形容词+ly构成副词时的拼法.slow→slowly/easy→easily/terrible→terribly(ble结尾的词是去e加y,如：possible→possibly)/true→truly(但：wide→widely)