27. Before a science group activity, the teacher explicitly teaches students English expressions such as "Take turns," "Work with your partner," and "Ask your group members for ideas" so that they can participate in the group task. According to Do Coyle's Language Triptych in Content and Language Integrated Learning (CLIL), which type of language do these expressions best represent?
(A) Language of learning
(B) Language about learning
(C) Language through learning
(D) Language for learning