ICMP 协议是直接承载在( )协议之上的。
A
暂无解析
重写句子：Fossilfuelsarenon-renewable.Weneedtofindalternativeenergysources.(compoundsentence)
Ifanearthquakeoccurred，someoftheone-storeyhouses________.
Since1971theCanadiangovernmenthasadoptedapolicyof________,recognizingthatculturalpluralismwithinabilingualframeworkistheessenceoftheCanadianidentity.
改写病句：WhiledrivingonBlueberryAvenueyesterdayafternoon,atreefelltowardJack
严复翻译的《天演论》，其原文的题目是（）