Cambridge University is one of the ____(old) universities in the world, and one of the largest in the United Kingdom. It is famous ____ outstanding academic achievements and the high quality of research undertaken in a wide range of science and art subjects. The university pioneers work in the ____ (understand) of diseases, the creation of new materials, advances in telecommunications and the research into the origins of the universe. It trains doctors, veto, architects, engineers and teachers. At all levels about half of the students at Cambridge study arts and humanities, many of ____ have gone on to become outstanding figures in the arts, print and broadcast ____(medium). The university's achievements in sconces can be measured by the sixty or more Nobel Prizes ____(award) to its members over the years.

    As Cambridge approached ____(it) eight hundredth anniversary in 2009, it was looking to the future. The modern university is an international center of teaching and research in ____ vast range of subjects. It continues to change in response to the challenges it faces. The 1990s ____(see) a major expansion of the university accommodation for teaching and research. There are many major new buildings either underway ____ already completed, including the Law Faculty Building and the Judge Institute of Management Studies.

造成欧美等许多特大城市中出现“唐人街”的主要原因是(    )

阅读文段，回答问题。

    我是生长在它旁边的一双耳朵。当时我不觉得幸运，以为这音乐、这波涛的诉说、这不尽激情的灌注，都是理所当然的。以为这柳阴是理所当然的，洋槐洁白芬香的花絮是理所当然的，竹林里布谷鸟黄鹂鸟的啼鸣两岸是理所当然的，两岸湿润的炊烟和歌谣是理所当然的。当时幼稚的心里，却有一个与生俱来的念头：这河流以及与它有关的一切，理所当然属于我们。

画线的部分，主要运用了排比手法，有何作用？