和平共处，合作共赢，和平与发展仍是当今世界两大主题。阅读下列材料，回答问题：
材料一：欧洲的分裂所造成的影响像是灾难性的。20世纪前半期欧洲的两次分裂带来的只是生灵的涂炭、文明的衰退和地位的削弱。在不到一个世纪的时间里，被誉为“世界工厂”的“日不落帝国”，在欧洲第二次分裂后不得不依附于美国。事实上，丘吉尔在1943年德黑兰会议期间，就已经意识到“英国是一个多么小的国家”，他说：“我的一边坐着把一条腿搭在另一条腿上的巨大俄国熊，另一边是巨大的北美野牛，中间做的是一头可怜的英国小毛驴。”
材料二：二战后，复杂的政治局势和严峻的经济形势，使欧洲一些远见卓识的政治家们认识到欧洲合作的必要性。20世纪50年代，随着西欧经济的恢复和发展，越来越多的人主张建立一个密切合作的联盟。

    I went on vacation with my family last summer. “Wake up! It's time to go fishing,” My mom woke me up. After having breakfast we got on a boat. Getting up at 6 a.m. was really early and I was not happy, but later, I had fun.

    My uncle caught (抓住) a big fish first. And my mom caught one, too. Then I caught a Black Drum. Next, my dad caught a big Sheepshead. The captain said no one caught a big fish like this one. We were all happy when we heard this. Later we tried to catch small sharks (鲨鱼). My grandpa caught one, but it snapped the line (咬断绳子). My uncle caught one, but it also snapped the line. My dad caught one at last. It didn't look so scary but was a little funny.

    Then our fishing activity was over, and we went back with all the fishes. We were tired but happy!

如果-2是 a 的立方根,那么下列结论正确的是（　 　）