Which of the following statements are the demerits of a commonly used language?
选项：

A:A global language improve the communication among different people and cultures.;
B:A bridge language will damage the heritage and transmission of the local culture.;
C:English as a global language transmits a lot western-oriented values and beliefs all over the world, and affects the values of the local people.;
D:A bridge language can speed up the transmition and interaction of different cultures.