题目

I don’t like getting up too early unless I have to. When you’re filming, you’ve got make-up on, which doesn’t happen often. As I’m not filming at present I’ll get up at 8:30. Work normally means Matt coming over to my house about 10 am. We’re writing at the moment. We’ll chat for a bit before going to my study. One of us will have an idea for a sketch （梗概）, we’ll talk about the characters and when we feel we have enough we’ll start writing. Matt and I met at the National Youth Theatre in 1990 and started doing shows together in ’95, at the Edinburgh Fringe festi如图所示的电路中，电源两端的电压保持不变，电阻R2与R3的阻值均为10Ω．闭合开关S，电流表A1和A2的示数之比为3：2．若把电流表A1和A2分别换成电压表V1和V2后，电压表V1的示数为U1，电压表V2的示数为U2．则下列选项正确的是（ ）A．R1=5ΩB．R1=20ΩC．U1：U2=3：4D．U1：U2=3：2