" I was wondering if you ______ give me a stamp?" " I think I' ve got some. Here you are."
A、may
B、might
C、will
D、could
第1题:
乳牙萌出的顺序为
A.I→Ⅱ→Ⅳ→Ⅲ→V
B.I→Ⅱ→Ⅲ→]V→V
C.I→Ⅲ→Ⅱ→Ⅳ→V
D.Ⅱ→I→Ⅲ→Ⅳ→V
E.Ⅱ→I→Ⅳ→Ⅲ→V
第2题:
一I'm very tired. I've please just finished work .
--- ____.
A. Well,you'd better go home and have a good rest
B. Oh,great! Congratulations
C.Ok,I'11 give it to you tomorrow.
第3题:
(A) think
(B) am
(C) mean
(D) talk
正确答案:C
解答参考:C。mean:意指,意谓,mean business:固定短语,当真。【译文】不要以为我是在开玩笑,我可是当真的。
第4题:
第5题:
What can I do for you, Madam?
()500yuan in cash to my son in Beijing University.
A、 You’d better remit
B、 I'd like to remit
C、 I'd rather remit
第6题:
1.I ______they ______tomorrow.
A. think; won’ t come
B. don- t think ; come
C. don't think; will come
D. think; come
第7题:
Kathy, I’d like you to meet Maggie Jacobs.
(). Maggie. You’re doing a great job.
A、 I‘m pleased to meet you
B、 It’s great to see you again
C、 I' m happy to meet you too
第8题:
A.me; me
B.me; has
C.I; am
D.I; is
第9题:
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;
第10题: