隧道浅埋、下穿建筑物地段，地表必须设置（）并实施监测。
参考答案：监测网点
债务人将其权利移交给债权人占有，用以担保债权实现的方式是（）。
A.保证
B.质押
C.抵押
D.留置
—How many birds can you see in the tree?
—_______. All the birds have flown away.
A. None
B. No one
C. Nothing
D. A few
