There are a number of things ______ him. He did nothing but ______ a lot of wine yesterday evening. [ ]

A. worrying; drink

B. worrying; drank

C. worried; to drink

D. worried; drink

理发用的电吹风机中有电动机和电热丝，电动机带动风叶转动，电热丝给空气加热，热风将头发吹干。设电动机线圈的电阻为R₁，它与电热丝的电阻R₂相串联，接到直流电源上，电吹风机两端电压为U，电流为I，消耗的电功率为P，则有

A．UI>P

B．P=I²(R₁+R₂)

C．UI<P

D．P>I²(R₁+R₂)