题目

－What do we need to buy?－________.A.Two kilos of potatoes and two packets of saltsB.Two kilos of potatoes and two packet of saltC.Two kiloes of potatos and two packets of saltD.Two kilos of potatoes and two packets of salt 答案：【答案】D【解析】试题句意：我们需要买什么？——两千克土豆和两袋盐。英语中potato是可数名词，变复数后面接es。Salt为不可数名词，没有单复数变化，kilo变复数是在后面加s，故选D。如下图所示R1=10 Ω，R2=R3=20 Ω，下列关于R1、R2、R3消耗的电功率P1、P2、P3以及R1、R2两端电压U1、U2的关系正确的是  A.U1=U2     P1=P2=P3                                   B.U1＞U2     P1∶P2∶P3=1∶2∶2C.U1=U2    P1∶P2∶P3=2∶1∶1                    D.U1＜U2    P1＜P2=P3