开篇

　　1) Many nations have been faced with the problem of ...
　　2) Recently the problem has been brought into focus.
　　3) Recently the phenomenon has become a heated topic.
　　4) Recently the issue has aroused great concern among ...
　　5) Nowadays there is a growing concern over ...
　　6) Never in our history has the idea that ... been so popular.
　　7) Faced with ..., quite a few people argue that ...
　　8) According to a recent survey, ...
　　9) With the rapid development of ...