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The walls are made of hollow concrete blocks.
A:empty
B:big
C:long
D:new
B:big
C:long
D:new
参考答案
参考解析
解析：本句意思：墙壁是由空心的混凝土块砌成的。单词empty意思为“空的”，和hollow（空 洞的，虚无的）意思接近。单词big意思为“大的”; long意思为“长的”; new意思为“新的”。
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