施工区周围的孔洞应采取措施可靠的遮盖,防止人员摔伤。
参考答案:对
My cousin used to ________ online too late, but now she is used to ________ to bed early.
A.chat; go
B.chatting; go
C.chatting; going
D.chat; going
封闭的火区,只有经取样化验确认火已熄灭,方可启封或注销。