当今世界各国联系如此紧密，我们不应当仅仅关注自己的国家和自己的文化。

当今世界各国联系如此紧密，我们不应当仅仅关注自己的国家和自己的文化。
【正确答案】：In a world so closely （or, tightly） connected, we should not be interested only in our own country and our own culture, or We should not be interested only in our own country and our own culture, because（for/since) the countries in the world are so closely connected.