there are more than three times as many households where the children and grandchildren are living in their grandparents' homes as there are households [where the grandparents are living in their children's or grandchildren's home.
choice a, which定语从句中先行词是$950 million, 逻辑错误
choice b,c:It doesn't make sense to say that $950 million is part of a deal that will make the company the largest manufacturer. The purchase of the rival company is part of a deal, but the price itself is not
choice d, to make作为目的状语，make的发出者是computer company，公司不能够使公司成为第一，而应该是deal
"as ADJECTIVE as..." and "as ADVERB as..."第一个as是副词用于修饰形容词或者副词，第二个as是连词
are extremely common expressions to indicate equality in some measure (or inequality, if some multiple or percentage is in front of the construction). e.g.
choice a,'the national average' would be exactly what it says: an average.i.e., some kind of statistic. 全国平均值是一个数字，在这里构成比较的应该是人
试着分析一下，首先要弄清楚intended meaning: 温室气体的讨论集中在全球是否变暖，和变暖的程度。但是气象学家们认为具有最明显的效果，和对人类造成最大影响的却是极端气温、降雨和磁暴。
choice a, 语法和意思均正确
choice b, that宾语从句是一个主系表结构，主语变成了1）具有最明显的效果，2）极端气温，3）降雨，4）磁暴。同时4个名词作主语意思就变了。即便把2）3）4）看作1）的同位语，意思也变了：具有最明显效果的也是对人类影响最大的那些。
choice c, 分析同choice b, 并且effects to have the largest impact不定式作定语是有问题的。常见用不定式作为名词定语的有：way to do sth
choice d, that宾语从句中没有谓语动词，并且第二个that引导完整的句子，并没有可以并列的对象
choice e, which引导的定语从句往前修饰3个并列名词，语法是可以的。但是意思改变了，整个句子表达的意思是1）极端气温2）降雨 3）磁暴是对人类影响最大的。相对于choice a, 信息量减少了
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没有看清语义。。两句话都不是一个方向