每日一练：职称英语考试A级每日一练(2015-12-9)
【单选题】
The walls are made of hollow concrete blocks.
A. big
B. long
C. new
D. empty
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每日一练：职称英语考试A级每日一练(2015-12-9)
【单选题】
The walls are made of hollow concrete blocks.
A. big
B. long
C. new
D. empty
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