Which of the following statements are true?
A、In the classic form of Community Language Learning, teacher as a "Knower" stands outside a circle of students and translates, suggests or amends the students' utterances.
B、Suggestopedia can help students be comfortable and relaxed so that their affective filter is lowered.
C、Total Physical Response (TPR) attempts to teach language through physical activity.
D、Compared with Suggestopedia, the Silent Way rests on more cognitive than affective arguments.