[单选题]紧固电极连接件时所用的工具要带有（ ），应避免蓄电池极柱短路。
A.绝缘手柄
B.绝缘夹钳
C.绝缘护套
D.绝缘隔板

It isn’t just an urban myth: life in a city really is getting more dangerous, and the sources of peril are not just human ones like muggers and reckless motorists. A report by UN-Habitat, an agency responsible for human settlements, says the number of natural disasters affecting urban populations has risen four-fold since 1975.
Some of the reasons are obvious, others less so. As the world’s population grows, people are crowding into mega-metropolises, where life’s risks are horribly concentrated. The after-effects of a natural disaster can be especially dire in a vast, densely-packed area where sewers fail and disease spreads.
At a pace that no urban planner can control, slums spring up in disaster-prone areas—such as steep slopes, which are prone to floods, mudslides or particularly severe damage in an earthquake. Many of the world’s cities are located on coasts or rivers where the effects of climate change and extreme weather events,