Underline the controlling idea in the following sentence.For years pollution has been a big problem in industrialized countries.
查看答案
Underline the controlling idea in the following sentence.There are several reasons why a sick person should stay at home rather than in hospital.
Underline the controlling idea in the following sentence.During the process of civilization, however, traveling has added more meanings to human life.
Underline the controlling idea in the following sentence.Human beings are the real polluters who have spoiled the natural environments.
Underline the controlling idea in the following sentence.Modern communication technology is driving workers in the corporate world crazy.