如图电路中，闭合开关S，两只电压表示数如图乙，则电源电压为____V，灯L₁两端电压为____V，灯L₂两端电压为____V．

根据英文单词，找出相对应的中文。

blackboard

读印度农作物分布示意图，印度农作物分布具有明显的区域性，这种区域分布的主要依据是(    )

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 ?

如图所示，正方体重力为50N，请在图中画出F₁的力臂和正方体所受重力的示意图。