Many people do not like to stay at home on vacation. They usually 1out to see something different or do something exciting. So people from the country come to the city and people from the2go to the country for vacation. During the vacation, trains, buses and planes are all very busy. It is very hard to buy train tickets or air tickets. Many people3cars or buses for traveling.

    Last May Day my family went to the countryside in our4. There was too much traffic on the road, so we had to move very slowly. It took us about an hour to get out of the city. Two hours5, we came to a hill. It was6. We thought this was a good place for a picnic, so we stopped and7the food, fruit and drinks out of the car. We sat down and began to8. Suddenly it started to9, we had to run back to our car and have our food in the car. Then we drove back home. What a10trip!

从分散隔绝到联系紧密，今天的我们都生活在“地球村”。

①促成世界开始连成一个整体的重大历史事件是____。

②第二次工业革命中，____的发明使人类真正进入了航空时代．

③当今世界最大的国际政治组织是____。

若双曲线$\frac{x^2}{a^2}$﹣$\frac{y^2}{b^2}$=1（a＞0，b＞0）的渐近线方程式y=±$\sqrt{3}$x，则双曲线的离心率为（　　）