题目内容

Facebook was created in ______ on Harvard campus.

A. 2005
B. 2006
C. 2004
D. 2007

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Twitter allow users to send and read short_______character messages called tweets.

A. 140
B. 130
C. 114
D. 104

______has more than 500 million monthly active users.

A. Qzone
B. Youku
C. Wechat
D. Weiboo

Qzone was created by Tecent in __________.

A. 2004
B. 2005
C. 2007
D. 2008

在解析几何中,便于研究二次曲线的几何性质我们可以适当的选择坐标旋转变换

A. 对
B. 错