（2014·绍兴）把滑动变阻器R和定值电阻R₁连接成如图电路，变阻器最大电阻R=2R₁。闭合开关S，当滑动变阻器的滑片向左移动时，下列叙述正确的是(    )

“洹水安阳名不虚，三千年前是帝都。”这是著名历史学家和考古学家郭沫若同志1959年考察殷墟时留下的著名诗句。下列文物出土于殷墟的是（    ）

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　　Today is Sunday. It's fine today. Jenny goes to the zoo with her mother. They can see many animals. There are tigers, lions, pandas, snakes and many more. Look! The pandas are over there. They're from Sichuan, China. Look at the baby panda! It's climbing the tree. How cute it is!

Next, they go to see the lions. The lions are so strong. Their mouths are too big. The tigers are next to them. They are from Asia. They are yellow and black. At last, Jenny and her mother go to see the monkeys. Some are cl imbing mountains, and some are eating bananas. The monkey is Jenny's favourite animal. It's so fun!

     Jenny sees a lot of animals at the zo o and she is so happy today!

小萱想利用一块电流表和阻值已知的电阻R₀测量未知电阻R_X的阻值。小萱选择了满足实验要求的实验器材，并连接了部分实验电路，如图所示。