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Dad, this is my roommate, Andrea.()
A. Hello, Andrea. I've heard so much about you
B. Hope to meet you again
C. It's very thoughtful of you
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在J2EE中,在my.jsp中使用标记扩展,下列选项正确的是()
A.%@taglibURL=”/hello”prefix=”examples”%B.%@taglibURI=”/hello”prefix=”examples”%C.%@tagliburl=”/hello”prefix=”examples”%D.%@tagliburi=”/hello”prefix=”examples”%
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听力原文：M: So, Jane, how long have you been an author?W: Well, Tom, I didn't start writing until I was in my thirtieth, and I'm over seventy now. So goodness, I must have been writing for about forty years.How long has the woman been an author?A．About 30 years.B．About 40 years.C．About 60 years.D．About 70 years.
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4．I __________my teacher carefully，but l __________nothing．A． listened，listenedB． heard，listened toC．listened to，heardD． listened to，listened
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— Hello, Sally. How’s everything? —().
A、Good for youB、Oh, I agreeC、That’s rightD、Just so-so
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I ()supper when I()someone knocking at the door.A、made . . . HeardB、made . . .was heardC、was making . . . was hearingD、was making . . . heard
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B 宽度优先（种子染色法）5．关键路径几个定义： 顶点1为源点，n为汇点。a. 顶点事件最早发生时间Ve[j], Ve [j] = max{ Ve [j] + w[I,j] },其中Ve (1) = 0;b. 顶点事件最晚发生时间 Vl[j], Vl [j] = min{ Vl[j] – w[I,j] },其中 Vl(n) = Ve(n);c. 边活动最早开始时间 Ee[I], 若边I由j,k表示，则Ee[I] = Ve[j];d. 边活动最晚开始时间 El[I], 若边I由j,k表示，则El[I] = Vl[k] – w[j,k];若 Ee[j] = El[j] ，则活动j为关键活动，由关键活动组成的路径为关键路径。求解方法：a. 从源点起topsort,判断是否有回路并计算Ve;
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