题目

I may not be on Vine or whatever the kids are using these days, but I’m on Facebook, Twitter and Instagram. I love being able to stay in touch with people living on the other side of the planet, I like sharing pictures of my cat and I’m even one of those people who shares lots of food pictures. I enjoy seeing people “like” my posts and comments, and my Facebook app is the first thing I look at in the morning-sometimes even before my eyes are fully open.That being said, I haven’t posted a pictures about being pregnant on Facebook or anywhere else. I actively keep an eye out for any of首次证明地球是球体的历史事件是 (    ) A.哥伦布到达美洲大陆                B.麦哲伦环球航行 C.人造地球卫星的发射和使用          D.大地测量技术的产生与进步