错选D, 复数名词 20-foot-long implements和单数名词a bull rake在单复数上不匹配，由于两者上known as的关系，所以应单复数一致。

here are two examples to illustrate.
it is december 2007; the world record in the discus throw has stood since 1986.
it was july 1991; the world record in the long jump had stood since 1968. --> but it was broken later that year

when we use the present perfect, we don't usually have a second event, because the second 'event' is the present. on the other hand, when the time described in a sentence is actually in the past (because of the way the sentence is narrated), then whatever would normally occur in the present perfect must be translated into the past perfect.

C: 'the 35 years since' implies that the present is 35 years after the release date. not only does this conflict with the meaning of the original, but it also renders the past perfect (from the underlined part) inappropriate: you'd need present perfect in this case. also, since the release is a point event, it would belong in the simple past.

考語意清晰

beV is a linking VERB. so HOUSEHOLD cant be 5 million.
household/= 5M.
CD關鍵在後方修飾語:是 5M vs. total population or households vs. total population?

自己檢討非母語人士這裡不應該先解flat,flatly,只有ABC表結果,E表原因錯誤
無動作者就用被動,不用虛主詞 選B

问的是依据什么，问的是前提，问的是因

B为什么不对呀

labor's unqualifying support 表达错误, unqualifying 修饰labor还是support有歧义. GMAT语法中名词所有格使用要谨慎

the price per barrel to which oil would have to rise in order for new solar power plants to be more economical than new oil-fired power plants),每桶油要涨价到多少才能让新的太阳能公司比新的火油能量公司更经济. 技术的进步是的太阳能公司发电的效率提升,但是阀值(即每桶油需要涨到的价格)不变. 即新的太阳能发电效率与Oil-fired power公司发电效率之间的差值不变, 所以oil-fired power的发电效率也必须提升.

当“非数字物体（即，这个名词本身没有纯粹的数字概念，例如dogs、cats等绝大多数名词）”比较时，我们通常会用double(twice) as much as或double(twice) as many as，例如：
twice as many dogs
double as much water
但是，当“数字”比较时，我们不能加as many或as much，例如：
twice the increase
double the decrease

https://bichu.com.cn/question/Prep2008E1-SC-181

提问：
1、and并列的是can和tends？
2、所以【researchers have discovered】充当的是什么呢？

that the trajectories of ballistic missiles are affected，这句话为什么是表语从句？

create the consciousness是重点

本题重点不是多花钱，而是为不想要的功能付钱
所以E选项是说没有只有计算功能的电脑，是想说有的人只想要有计算功能的电脑但是没有，就肯定会有人买了自己不想要的功能

错选A：没有注意到spread的单复数问题！！！！

这篇文章感觉是典型的题比文章难系列

結論句沒抓好,其實結論很多橋可以搭: 藥含量很低,存在很久且對健康無害
答案橋搭得很完善: 很久以前藥含量高都證明沒事了

或者说，这种一增一减型的选项只能用于填补逻辑漏洞很大的assumption题里，而不能用于计划题里。譬如”某钢铁制造工厂倾销老库存，但他还是赚钱了，问你assumption？“我们可以说因为他价格下降了，但销量提升了，因为我们作为外人是在合理的范围推测可能的条件，去弥补这个逻辑漏洞。但如果有道题说“某钢铁制造工厂倾销老库存，他们预期这样就会赚钱”。我们当然不能说因为价格下降销量提升，因为在计划里我们是计划者，这种推测是不严谨的，我们要的是确切的东西。于是，我们可以说因为最近钢铁价格上涨，即使是倾销，老库存也可以卖出更高的价格。