2015年第10号台风“莲花”于7月5日4时在菲律宾吕宋岛东北部沿海登陆，至少11个沿海城镇发生严重水灾，大面积地区断电及通讯中断，部分航班被迫取消。据此回答下题。
阅读下面短文，根据短文内容回答问题。
My name is Grace. Today is Sunday. It is a nice day. It is also my grandfather's birthday. He is 80 years old. My parents and I go to his home. We don't get up early because the alarm clock (闹钟) doesn't work. We don't have much time for breakfast. We go to a supermarket to buy some fruit and a birthday cake at eight thirty. Then we go to my grandparents' home quickly. We get there at 11:15. My grandparents are very happy to see us. We have lunch at 12 o'clock. After lunch, we play chess with my grandfather. It is interesting. We go home at about four o'clock in the afternoon. It is a happy day.
关于自然灾害的叙述，正确的是（ ）
海带中含有的碘元素，以I﹣形式存在，因此可先用 ____将其氧化为 ____，然后利用 ____这一特性检验．
实验桌上有如下实验器材：满足实验要求的电源（两端电压值符合实验要求且保持不变）一个、阻值已知的定值电阻一个，电阻箱（电路图符号）一个，滑动变阻器一个，已调零的电流表、电压表各一块，开关一个，导线若干。请选用上述实验器材，设计一个实验证明：在R1与R2串联的电路中，如果R2的电阻值和通过它的电流保持不变，则电阻R1与R2的总电功率P与电阻R1的关系为P= kR1+ b（k和b均为不变量）。请画出实验电路图，写出实验步骤，画出实验数据记录表。
）一个，滑动变阻器一个，已调零的电流表、电压表各一块，开关一个，导线若干。请选用上述实验器材，设计一个实验证明：在R1与R2串联的电路中，如果R2的电阻值和通过它的电流保持不变，则电阻R1与R2的总电功率P与电阻R1的关系为P= kR1+ b（k和b均为不变量）。请画出实验电路图，写出实验步骤，画出实验数据记录表。