第7题: [简答题]what is LFI？ 参考答案:LFI（Link Fragmentation and Interleaving） is a layer 2 technology that reduce delay and jitter for small packets （for example， VoIP） on low-speed link.It works by breaking large packets into small fragments and interleaving small packets with fragments of large packets.
第28题: [单项选择]If you don't ______ smoking and drinking, she will break up with you. A. gave up B. give up C. had given up D. will give up 参考答案:B 答案解析:[解析] 这句话的意思是“如果你不戒烟戒酒的话，她将要和你分手”，这里从主句“she will...”判断出这是一个“主将从现”的句子，而不是虚拟语气，故正确答案为B选项。
