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This city, ________ (which/where) is very big is also very friendly.

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Complete the passage with the appropriate words given in the brackets.My sister and I may look similar but when it comes to hobbies, we are very different. I have a very busy (1)(schedule/hobby/group) and I like to keep active all the time. I’d be (2) (happy/excited/bored) if I stayed at home! My sister prefers to chill out and stay (3) (indoors/outdoors/interior). Her hobbies are calligraphy and painting and she does some really (4) (awful/awesome/boring) work—I think she’s very talented. In fact, last month, some of her work was in an (5) (expedition/expectation/exhibition) in our local art gallery—I was very proud of her.

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上交源程序代码（.c 或 .txt），以附件的方式上传。

一个具有n个顶点的无向完全图包含（）条边。

A. n(n-1)
B. n(n+1)
C. n(n-1)/2
D. n(n+1)/2