David has won the first prize in singing; he is still very excited now and feels________ desire to go to bed.

A．the most

B．more

C．worse

D．the least

额定电压为5000V的兆欧表，若其短路输出电流为80μA，其内阻为（）。

A、52MΩ

B、62MΩ

C、72MΩ

D、82MΩ