13.A surge in new home sales and a drop in weekly unemployment claims suggest that the economy might not be as weak as some analysts previously thought.这里的claims是做名词么，什么意思 18.Plants are more efficient than fungi at acquiring carbon,in form of carbon dioxide,and converting it to energy-rich sugars. 这里acquiring和converting是平行吧？虽然没划线，那么能在converting前面加at么 26.Emily Dickinson's letters to Susan Huntington Dickinson,which were written over a period beginning a few years before Susan's marriage to Emily's brother and ending shortly before Emily's death in 1886,outnumber her letters to anyone else. which were跟在Dickinson后面指代letters?不是定语从句先行词要紧挨着指代的词么？我一直是这么记的 62.When Congress reconvenes,some newly elected members from rurual states will try to etablish tigher restrictions on the amount of grain farmers will be allowed to grow and to encourage more aggressive sales of United states farm products overseas. 这里will be allowed to...做什么成分？前面已经有了will try to establish，这里还是谓语么，怎么读不通啊，还是我断句有问题，求指导 77.The only way for growers to salvage frozen citrus is to have it quickly processed into juice concentrate before warmer weather ruturns and rot the fruit. rot the fruit的主语不是weather么，怎么不用第三人称单数？ 82.According to a recent poll,owning and living in a freestanding house on its own land is still a goal of a mojority of young adults,as it was of earlier generations. 这里的it 指goal么？求问that,it,this,those的指代区别？是完全一样的事物才用it么 93.Heating-oil prices are expected to be higher this year than last because refiners are paying about 5 a barrel more for crude oil than they were last year. 后面一个比较是than they were last year,前面一个比较能不能是than that of last year,这里than last是简写么
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