脚手架上堆砖高度不得超过（）皮侧砖。
A.二
B.三
C.四
D.五
参考答案：B
—Has she got a dog?
—_____. It is black and white. [ ]
A. Yes, she is
B. Yes, she has
C. No, he has
D. No, she isn't
老年男性急性尿潴留常见的病因是（）
A．前列腺增生
B． * * 结石
C． * * 外伤
D．膀胱异物
E． * * 肿瘤
