Many nations in the world are facing the loss of their mother tongue's right to speak on the world stage, and have to rely on the West to make up their language, thus gradually weakening their own culture. This passage can be used to prove which of the following points? ['The importance of protecting the mother tongue of the nation.', 'Language is also divided into strong and weak.', 'Reasons for the gradual weakening of national culture.', 'We cannot adhere to the West in language.']