则D（ξ）的最大值为____．

Jerry is the kind of guy you love to work and live with. He is always happy and always has something       to say. When someone asks him how he is doing, he must reply, “If I         any better, I would be twins! ”

Jerry is an         manager because he has several waiters who have followed him around from restaurant to restaurant. The reason the waiters follow him is his          to life. He always         others. If a waiter is having a bad day, Jerry is there telling the waiter how to        the positive side of the situation.

I was very curious(好奇的) about his positive attitude,        one day I went up to Jerry and asked him, “I don’t get it! You are a positive person      . How do you do it? ”

Jerry replied, “Each morning I          and say to myself, ‘Jerry, you have two choices(选择) today. You can choose to be happy or you can choose to be unhappy. ’I choose to be happy. Each time something bad happens, I can choose to be a victim (牺牲品)or I can choose to learn from it. I choose to learn from it. ”

Life is all about choices. Please remember: “You are what you       . ”

某公司是一家效益很好的企业,后来,一线工人的年收入不足高层管理人员的十分之一。优秀工人纷纷跳槽。新领导上任后,大幅度提高一线工人的劳动报酬,公司又红火起来。该公司经济效益的变化说明了(　　)

①有差别就不公平,必然影响企业工人的积极性

②效率是公平的物质前提,必须反对平均主义

③公平是提高经济效率的保证,防止收入差距悬殊

④合理的差别内共享劳动成果有利于提高效率

①土地    ②农具    ③牲畜    ④房屋