下列图片反映了现代国际关系中一系列重大事件。导致这些事件出现的共同原因是（   ）

三八线

修建柏林墙          

北约标志                      

古巴导弹危机漫画

有机物分子中基团间的相互影响会导致化学性质不同．下列叙述不能说明上述观点的是（　　）

    Now you are in a dinosaur ____park. Coming here, you will find a kind of old ____, dinosaur, which died out millions of years ago. In our park, we are happy to show you ____ dinosaurs, which lived in the Jurassic. The four-storied-building-high grass-eating dinosaurs are submissive (温顺的) and kind. You can ____ towards them and touch them. But the ____  of them are dangerous. The four-legged meat-eating dinosaurs are very cruel. Please don't ____ them and don't try to give them food. The ____ here is very thick and full of all kinds of animals that lived in the Jurassic. Without any special____and the leading of the guide, please don't step into it. OK, I'm sure that our park will ____anyone who comes here and you will ____a lot from it.