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A.We thought of trying to describe each emotion but it would have been almost impossible to make clear rules for this.
B.These particular muscles are difficult to control， and few people can do it.
C.Research has also been done to find out which areas of the brain read the emotionalexpressions.
D.They decided that it was a mental state that could be preceded by "I feel"or "he looks"or"she sounds".
E.He said that the expression of these feelings are universal and recognizable by anyone， from any culture.
F.Any other method of showing all the 412 emotions， such as words， would have been far less effective.请帮忙给出正确答案和分析，谢谢！