What does the man mean?
A.The library no longer had the book on reserve.
B.The library closed earlier than hed expected.
C.The professor had chosen a mystery book for him instead.
D.The homework isnt clear.
第1题
深度知觉产生的主要线索是()。
A.线条或空气的透视作用
B.眼睛的调节作用
C.双眼视轴的辐合作用
D.双眼视差
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