______by Columbus in 1492,the island, or at least the western part of it now known as Haiti, was the scene of some of the most advanced political developments in the western world_________the eighteenth century, whose success_________the labor of half a million slaves

A．Discovered ; well in; rested on

B．Discovered; late; relying on

C．Discovering; well in; counting on

D．Discovering; lately ;depends on

巷道内温度超过（）时，禁止佩戴氧气呼吸器从事救护工作。但在抢救遇险人员或作业地点，靠近新鲜风流时例外，否则必须采取降温措施。

A.35℃

B.38℃

C.40℃