选词填空。

    What was I like when I was young? My mom said l was lovely．I was____in everything．I liked oil____．I liked riding a horse．I liked____a cow．I liked helping____vegetables on the farm．I also liked shopping．At the supermarket I didn't buy____cheap．I was only interested in expensive things．Haha，I was a funny boy when I was young，wasn't I ?

我国历史上实行的考试选拔官员的制度，在一定程度上体现了公开、公平的原则。科举制度创立于（    ）

已知O是△ABC内一点，若$\overrightarrow{OA}+2\overrightarrow{OB}+3\overrightarrow{OC}=\overrightarrow{0}$，则△AOC与△ABC的面积的比值为 （   ）

有两个电路元件A和B，流过元件的电流与其两端电压的关系如图甲所示．把它们串联在电路中，如图乙所示，闭合开关S，这时电流表的示数为0.4A，则电源电压和元件B的电功率分别是（　　）