按照____的高低，一般把世界上的国家分为发达国家和发展中国家。

阅读下列短文，从每题所给的四个选项中（A, B, C, D）, 选出最佳选项。

    My parents moved from Mexico to South Texas in the early 90s with the hope for a brighter future for their family of nine---my parents, four boys and three girls. My parents have always wanted the best for us and they have done everything possible to encourage us to get a university degree. Never did they think that by pushing us that direction, it also meant encouraging us to move away and be distant from each other.

Initially(起初), getting accustomed to the American culture and lifestyle was very difficult for my parents. They come from a culture where kids grow up together, go to school together and most of the time live in the same neighborhood. From our point, American family values were a bit different. Typically in the US, when you turn 18, you are expected to graduate from high school, move out, find a university, possibly find a partner, get married and start a life together. Most of these decisions take you away from home; usually you have to follow opportunity and wherever that will take you.

This is my family's current situation. I graduated from Bethel College in Indiana in 2010, and in order to fulfill my financial responsibilities of paying off student loans, I moved to Washington State for my job with Experience Mission. Ideally my parents wanted me to come home to South Texas, but that wasn't where my opportunity took me.

Currently, my sister Jennifer lives in Waco, Texas, about eight hours from my parents. My two younger brothers also decided to go to college at Bethel and are away from my parents. More than likely, when they graduate, they will probably not move back home to South Texas.

My parent never imagined that their dream for a better future would separate our family this way.Facebook has played a crucial(决定性的) role in the way we communicate while living in different places. Since we all use Facebook, we have found a place to connect and feel as if we were there together with each other.

阅读表达,阅读下面的短文，请根据短文后的要求答题。

    Choosing the right university for you is a big decision with many factors to consider. The institution that you choose will not only be the one that ensures your academic goals, but it will also be where you will live, learn, play sports, socialize and work for several years. Therefore, before you start filling out those university application forms, take a step back and consider the many variables that affect the “fit” of a university to your unique personality and educational goals. Take a look at the following factors, and decide which ones mean the most to you.

    Consider your educational goals. You will discover that different schools are  more recognized or progressive in your chosen field of study than others. For this reason, talk to advisors, professionals in your field, or go to clubs organized by the alumni(校友). When you check out school ranking for your major, you may find that your first choice is not really a match, while another fits perfectly.

    Consider costs. It will be no surprise to you at this point that not all schools cost the same. Some of the more famous schools are so because they are difficult to get into and difficult to pay for. Don't let this necessarily stop you. Just keep this consideration in mind as you narrow your list of potential schools.

    Choosing a university should not be done only on reputation, but also take the academic programs and overall environment into consideration. Be aware that reputations are sometimes out of date or overstated, so first-hand experience is often beneficial.

    Once you've identified the factors that are most important to you, you've taken the first steps towards making a successful choice. Make sure you pick a university that will serve your needs throughout your university career.

下图是某四国人口金字塔示意图。读图，完成下列问题。