从方框中选用合适的单词,并用其适当形式填空。 tourist, wide, meter, achieve, nature 1. Bill his dream of becoming a doctor last month. 2. Every year lots of come to Hangzhou for vacation. 3. Jenny has a circle of friends. 4. The tree is 5 long. 5. We grew up in the countryside, surrounded (环绕) by the beauties of . 答案:1. achieved 2. tourists 3. wide 4. meters 5. nature(1)小明同学用图所示的电路研究“电流与电阻的关系”,在连接电路时,开关必须_____,在开关闭合前,应将滑动变阻器的滑片移到_____(选填“最左端”或“最右端”);闭合开关,调节滑动变阻器使电压表的示数为6V,电流表的示数为0.6A,则定值电阻R的阻值是_____Ω;现将它换成15Ω的电阻接入电路来进行研究,则下一步应进行的操作是:_____.(2)小明同学按上面的电路研究通过导体的电流跟导体电阻的关系.电源电压保持不变,他不断改变R的阻值,测得相应的电流如下表,分析表中数据可知:电流跟电阻_____反比(填“成”或“不成”),这与欧姆定律_____(填“相符”或“不符”),其原因是_____.