读下图，回答相关问题（15分）。

材料一：

乙                                       丙

材料二：美国国内曾出现过四次人口迁移的高潮。第一次是19世纪中期人口大规模西移；第二次是在19世纪20世纪之交，人口由乡村大量流入城市；第三次是20世纪20年代到60年代，南部人口迁往北部和西部；第四次是20世纪60年代末到70年代初，东北部人口大量迁往南部和西部地带。20世纪70年代后，又出现人口向东北部和城市回流的现象。

（1）乙图中阴影部分的农业地域类型是    ___      ，分析地发展农业生产的自然区位条件。（4分）

（2）②地所在国上世纪60年代至70年代出现了国内人口迁移高潮，分析迁移的主要原因。（3分）

（3）乙图P城所在区域是世界最著名的传统工业区，在发展过程中出现了“春去春又回”的景象，即早期在丰富的       资源基础上发展起来，后因耗能高、运输量大和污染严重而出现衰落，但现在又“重震雄威”，说出所采取的措施有哪些？（4分）

（4）丙图中的Ⅰ、Ⅱ两条人口数量变化曲线，能反映乙图P城城市人口变化过程的是    线，出现这种变化的主要原因是什么？（3分）

When I tell people that I’m a professor of communication, they often are confused (1) what the term "communication" means. Many people think mass communication is the (2) type of communication, but mass communication is only one form of communication. The study of mass communication focuses on messages that are (3) over (4) such as television, newspapers, and radio. Other areas of (5) focus on the messages individuals send to one another. Some of the major contexts in which communication is studied (6) the interpersonal context, the organizational context, and the intercultural context. A scholar studying (7) communication, for example, might examine how married couples (8) with misunderstandings and the effects these misunderstandings have on (9) satisfaction. Organizational communication scholars, on the other hand, might study (10) the communication styles used by managers and their subordinates influence productivity and efficiency in a company or factory.
My area of specialization is intercultural communication. Intercultural communication is an (11) field of study which incorporates research from disciplines (12) as social psychology, sociology, cultural anthropology, sociolinguistics, and of course, communication. One of the (13) important areas of research addressed by intercultural scholars is how misunderstandings can be (14) when people communicate with Others from different (15) . To understand the process of intercultural communication, we must study how individuals’ cultural backgrounds (16) their communication behaviors.
The area of intercultural communication is a relatively new (17) of study even in the United States. While most Chinese students studying communication in the United States (18) on mass communication, there are some who are interested in intercultural communication and plan to return to China to teach and (19) research in this area. The work of these Chinese scholars on intercultural communication is important because it will help improve (20) between Chinese and Americans in the future.