A. the end of World War Ⅰ B. the Great Depression C. high unemployment figures D. a slump in the stock market 参考答案:D 答案解析:本题询问“GreatCrash”的所指。读者应该注意该提法出现的语境。相关语句为“The American stock market witnessed the‘GreatCrash’”,“Stock
第12题:[单选题] 416 下面哪个 OSPF 版本适用于 IPv6? A. OSPFv2 B. OSPFv3 C. OSPFv1 D. OSPFv4 参考答案:B (none) Explanation Explanation/Reference: