请查阅相关资料，指出20R2、22T1、45G1集装箱代号具体意义？
What does CLT emphasize?
A. Learning relying on the teacher for a model
B. Individualistic approach to learning
C. Authentic materials
Which is not the role of teachers in CLT class?
A. Monitor
B. Model
C. Facilitator
D. Organizer
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