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单项选择题A. The professional instruction.B. The human brain.C. Cries. D. Signals.

A. The professional instruction.
B. The human brain.
C. Cries.
D. Signals.

单项选择题A. Location of the school. B. Structure of the school. C. Layout of the school. D. Regulations of the school.

A. Location of the school. B. Structure of the school.
C. Layout of the school. D. Regulations of the school.