题目

A brief history of the garbage plate The garbage plate was born in Rochester，New York，at Nick Tahou Hots，a landmark restaurant famous for this great example of American extreme cuisine.The earliest version goes all the way back to 1918，when it was originally called “Hots and Potatoes”．The regular customers called it by the nickname “Hots and Po­tots” and it was basically a plate piled high with fried potatoes，baked beans，hot dogs，onions，mustard，and a chili­like meat sauce. It wasn't until many years later that the dish was officially renamed the “Garbage下图所示为我国某地的等高线图，若把同一个物体分别放在a点和b点，则物体的重力势能 [　　] A．在a点时大 B．在b点时大 C．在两点一样大 D．条件不足，无法判断