网络是一把双刃剑。作为一个普通网民，我们应该（    ）

①为了避免伤害，拒绝上网

②自觉抵御网络上的不良诱惑

③利用网络优势，努力学习

④遵守法律和道德，文明上网

设${\left|\begin{array}{cc}\frac{\sqrt{3}}{2}& -\frac{1}{2}\\ \frac{1}{2}& \frac{\sqrt{3}}{2}\end{array}\right|}^n$=$\left|\begin{array}{cc}1& 0\\ 0& 1\end{array}\right|$，n∈N^*，则n的最小值为（   ）

________Tom________ Mary speaks good Chinese, so they can talk with these Chinese students very well.

阅读下面对话，从方框内7个选项中选择5个恰当的句子完成此对话。

Jenney: Good evening, Nancy.

Nancy: Good evening, Jenney. How was the party last night? ____

Jenney: Yes. There was lots of fun.

Nancy: What about Alice? ____

Jenney: Yes. She enjoyed it a lot, too. By the way, I didn't see you. Where were you last night?

Nancy: Me? Oh, ____

Jenney: Why?

Nancy: There was a baseball match between Class 5 and Class 12. I really prefer watching a match to going to a party.

Jenney: ____

Nancy: It is a very exciting one. It is a very close match.

Jenney: ____

Nancy: Class 5 won the match. 86 to 82.

Jenney: Oh! What a pity to Class 12!