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

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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