完形填空

     George selected his food in Value Mart carefully. He estimated he had180cents today.He was pleased he had got good2for his money again.

      At the exit，the freezing wind3him of his gloves.He was sure he was wearing them whenentering the4.He made a search of his pockets.Then he thought theymust have been5somewhere in the store.George had bought the blackgloves for $35 ten years ago.They were leather，softand durable.Until then，hehad worn cheaper man­made material that never lasted long.His6to buythe gloves turned out to be good，whicheven7his position on the bus，aspoorer passengers stared at him8.

      George re­entered the store.He followed the same9he had walked before，10at the bread counter，to the dairy section，to the shelf where salt and sugar wereplaced.It did not take long to be11that the gloves were notthere.His12grew heavier.“People have changed，” he13.“Years ago，if somebody14something lost，they would give it back.”

      Ye the did not give up.This time he focused on the gloves on other shoppers’ 15.Suddenly he16a ladynearby wearing a black pair of gloves.He said，“Hi！” But when the surprised lady returnedhis17，hiseyes dropped to the floor，forthe fingers of her gloves were too small for him.

     Without gloves，hehad to18his hands into his sleeves.Back home，George was19.He could notdo without gloves.George decided to buy another leather pair.But before that，he stepped into Value Mart again tosee if by any20his gloves had been returned to the lost and foundoffice.The girl looked into her drawer and took out a pair of men’s leathergloves.“Are they？”

“Yes! Mine ！”George shouted with joy.

2017年是内蒙古自治区成立70周年，阅读材料，回答下列问题。

材料一：我国内蒙古自治区示意图

材料二：历史上，内蒙古高原曾经“水草丰美”“风吹草低现牛羊”，如今，很多地方却是草原退化、沙尘暴天气频发。内蒙古在70年代曾有草原12．3亿亩，80年代是11．8亿亩。但如今可利用的牧场只剩下5．8亿亩。现在，内蒙古西部的乌兰察布草原、科尔沁草原和鄂尔多斯草原因荒漠化已基本沦为沙地。

一个装满水的玻璃杯的总质量为700g，将一金属块放入水中，待水溢出稳定后，把杯的外部擦干，称得其总质量为1040g，将金属块取出后其总质量为500g，求该金属块的密度。