①齐桓公②秦穆公③楚庄王④晋文公

“真诚的友情是永久的，不会瞬时烟消云散。真挚的友谊像一棵青松，久久地挺立在山峰上。如果一生中你有许多知己与你共同分享快乐和悲伤，你的一生就会过得充实并且成功。”阅读材料谈谈友谊的重要力量。

阅读理解

    Mrs Gill lived next door to Nita．Every afternoon，Mrs Gill took a walk．She said it kept her young．Nita liked to talk with Mrs Gill when Mrs Gill came back．Mrs Gill was always happy after her walk．She often showed Nita something she had found．like a beautiful red leaf．

    One afternoon, Mrs Gill looked sad．Nita asked her why．

    I am sad about all the trash (垃圾)on the street．"she said．"I never saw so much trash in this neighbourhood(街区)!What happened?"

    "Mrs Trent moved．"said Nita．"She often went out each morning and picked up trash before．I often saw her on my way to school．"

    Mrs Gill looked very▲．"I thought I knew everything about this neighbourhood!"she said．"But you see more than I do!"

    "Well．1 wish I could do Mrs Trent's job．But you know,my back(背)often hurts．It's really hard for me to pick things up，"she said．

    "I could do that．"said Nita．

    Mrs Gill said．"I will carry the trash bag!You can use my gloves so your hands can stay clean．"

    Nita put on the gloves．She picked up pieces of paper．She picked up boxes．And Mrs Gill carried the bag．Lots of people stopped to thank Mrs Gill and Nita．The street looked much better．

    "Thanks, Nita．"said Mrs Gill．"Let's call ourselves the clean-up team!"

根据材料内容选择最佳答案。