单选题 The walls are made of hollow concrete blocks.
【正确答案】 D
【答案解析】【解析】题意:这面墙是空心砖搭建的。   句子中hollow的意思是空的,空洞的。   A中big的意思是大的;例句:We now have a big house of which we could not have dreamed years ago.我们现有的一座大房子是我们多年前没能想像得到的。   B中long的意思是长的;例句:Their clothes were all bunched up after being in suitcases for so long.他们的衣服在衣箱里放得时间这么长,以至都打褶了。   C中new的意思是新的;例句:I redirected his letters to his new house.我把他的信件改寄到他的新住所。   D中empty的意思是空的;例句:tte hurtled his empty gun at my face.他把空枪猛地朝我的脸上投来。故选D。