A man looking at his Smartphone while walking across a railway____(have) a close knock on Oct 22. He was so____(absorb) in his Smartphone that he did not see a train approaching until it brushed past him____(throw) him to the ground. This should serve ____ a warning that people should be aware of their surroundings, especially____ crossing roads.

    ____(lucky), the man survived, but the incident forced the driver ____(stop) the train. An 18-minute delay followed the incident____led to a break in the running of other trains on the route.

    Smartphone ____(addict) has spread like an infectious disease. It's evident that it will do great harm to society. What's even____(bad), some addicts become impatient with relatives and friends. Some people blame the Smartphone for the sad story, yet in fact people's weakening self-control and self-discipline are to blame.

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即热式节能饮水机

即热式节能饮水机已在地铁站、学校、宾馆等公共场所广泛使用，如图甲为我校教学楼层安装的某品牌即热式节能饮水机，其原理如图乙所示．烧开的水很烫不能立即饮用，即热式节能饮水机中的热交换套管很好地解决了这一问题，它的奥秘在于将进水管与出水管贴在一起，利用进水管中的冷水给出水管中的开水降温，同吋，进水管中的冷水被预热后送到加热腔中用电加热器烧开．

如图乙，当节能饮水机的出水流量为1.9L/min时，20℃的自来水经热交换套管后被预热成85℃的热水流进加热腔，同时有相同质量的100℃的开水从加热腔流 进热交换套管，变成可供直接饮用的温开水流出．

即热式节能饮水机喝水无需等待，即按即出，而且具有待机零功耗，比传统饮水机要节能、省电，真正倡导了绿色环保饮水新概念．

请回答下列问题：

采取人的中腔上皮细胞时，需要用的工具是：