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【单选题】
具有n 个结点的连通图至少有( )条边。A.
n
B.
n－1
C.
n+1
D.
n（n－1）/2
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举一反三
【单选题】- Hi, welcome back! Have a nice trip? - ____________.
A.
Oh, fantastic! Fresh air, and sunshine every day
B.
Come on, I've got lots of fun
C.
By the way, I don't like Saturdays
D.
Well, I'll look forward to your phone call
【单选题】Hi, welcome back! Had a nice trip? —__________.
A.
Oh, fantastic! Fresh air, and sunshine every day.
B.
Come on, I’ve got lots of fun.
C.
By the way, I don’t like Saturdays.
D.
Well, I’ll look forward to your phone call.
【单选题】听力原文：M: Hi Melissa! Welcome back! Did you have a good time in Peru? W: It was absolutely breathtaking. By the way, did you receive a copy of my final paper? M: Yes, it was very good. I want to congrat...
A.
She is an international student.
B.
It's her last semester in school.
C.
She has an internship position.
D.
She didn't feel secured in Peru.
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