The walls are made of hollow concrete blocks.A. big B. long C. new D. empty

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问题 The walls are made of hollow concrete blocks.

选项 A. big
B. long
C. new
D. empty

答案D

解析hollow的意思是“空心的”，如：a hollow tree, a hollow pipe。这里可以用empty来替换。

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丁hewallsaremadeofhollowconcreteblocks.AbigBlongCnewDempty