阅读下列有关能源问题的材料，完成题后问题．

能源是人类社会生活的物质基础．人类利用能源大致经历了三个时期：柴薪时期、煤炭时期和石油时期．可是，煤炭资源在许多国家已即将耗尽，如果以现今的开采和消耗速度，石油也只能再用一百多年了．如图是世界能源的主要来源统计图．

如图所示电路，电源两端电压保持不变。闭合开关S，当滑动变阻器的滑片P向右滑动时，下列判断正确的是（）

有一位顾客买菜时，把白菜外层还不太老的叶给摘了，售货员要劝阻他，该怎么说？请选出语气委婉又能起到劝阻作用的一项（   ）

阅读下列短文，从每小题的三个选项中选出最佳选项。

     Hello, I'm Linda. I have a garden. There are some plants and flowers in my garden. I like smelling flowers in it. Look at this small plant. It's a gift from my grandmother. It's for Children's Day. I like it very much. It is small and short. It has two small leaves. I water it every day. The plant grows and grows. Now it is big. It has more(更多) leaves. Now it has three pink flowers. They are beautiful. I like these beautiful flowers very much.