砌砖墙需留斜槎时，斜槎长度不应小于其高度的( )。
A．1/2
B．2/3
C．1/3
D．3/5
参考答案：B
One of the wonders of the _____ world is the pyramids in Egypt.
A．old
B．natural
C．modern
D．ancient
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