A:20米
B:15米
C:10米
D:5米
We have done much to protect the environment. So the river is getting than before.
—It was terrible! It rained a lot during my stay.
如图所示,在电路中两个规格完全相同的小灯泡L1、L2,闭合开关S后,L1、L2两端的电压分别为U1、U2,通过电流分别为I1、I2,则下列说法正确的是( )