sat语法题求解scientists (know from) the chemical composition of A

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sat语法题求解
scientists (know from) the chemical composition of Antractic ice (that) (there is) more carbon dioxide in the earth's atmosphere today than (the past) 650000 years
哪个括号里的错了?为什么?

第四个有错.
解析：
　　连词 than 前后应该是两个平行结构.
　　主句 there is more carbon dioxide in the earth's atmosphere today,从句应该与之平行的 there was (carbon dioxide in the earth's atmosphere) the past 650000 years.从句括号中部分与主句的语言信息重复,可以省略.但是,主句的 today 指现在,而从句的 the past 650000 years 指过去,因此主句的 there is 和从句 there was 属于不同时态,信息不重复,因此 there was 不能省略.
　　此处需要改为 than (there was the past) 650000 years
【注：the past 650000 years 属于副词短语,与主句的 today 是平行结构】

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