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【单选题】
听力原文：W: Your room is dirty. Your clothes are all over the floor and your bed is unmade. M: Clean it now. We'll all go on a picnic in half an hour. Q: What is the possible relationship between the two speakers? (15)A.
Mother and father.
B.
Mother and son.
C.
Teacher and student.
D.
Two students.
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A.
called up
B.
called on
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called for
D.
called out
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A.
called on
B.
called up
C.
called for
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called out
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