解析　句意：“什么使他最近不安？”“被单独留下面对棘手的问题。”因为问句是对主语进行提问所以回答的是主语的内容用动名词做主语和left之间是被动关系故用动名词的被动式做主语。答案　Being left阅读理解 体裁：记叙文　话题：助人为乐　时间：5分钟(2017·南昌二模)8－year－old Mario spent one day selling lemonade in New Jersey.But he didn't do it for spending money.“The people in the hospital need more medicinegirl who died of cancer eight years ago when she was eight years old.Alex's Lemonade Stand actually began four years before she died.That's when she announced that she wanted to sell lemonade to raise money for a cancer cure for all kids.

　　This year，thousands of kids across the country are selling lemonade to raise money for Alex's foundation.In Maryland，a group of kids at the Children's Guild held a fund－raiser for Alex in April.ar，when he was seven.This year，he raised more than $500 dollars.Harrison hoped it could help kids by scientists finding a cure.He also dreamed of finding a cure himself.“When I grow up，I'm going to invent these little nano－bots' that can swallow cancer.They can fight cancer for you with their little mini－lasers and stuffMario's lemonade stand even more special and amazing is that he，too，has cancer—six brain tumors.But Mario is not giving up.And he is determined to help other kids like him—in memory of Alex.“He lost a lot of friends who were in the hospital，” said Mario's mom，Anna.“And he wants to be sure that he doesn't lose any more.”

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