but是一个连词，必须连接两个句子（有时因为省略而看似只连接了两个功能相同的成分（详见功能平行））。本选项中but后是一个定语从句，由于该从句前没有平行的对象，所以在语法上不正确。

正确句意为：1914年cars和trucks共制造了469000辆，而在1929年仅trucks单独就有原来总数两倍那么多从组装线上下线。

A. the numbers错误，twice后面要跟单数的number，即twice the number；但是改为the number后，指代特定的数字还是用that number更为明确
B. Correct；that number指代前面总和的469000，如果是the number，没有指代对象，似乎说是the number of trucks
C. the number指代不清；by themselves是指卡车出售时没有附带配件，即单车出售，与alone意思并不相同。
D. 用as many trucks时，整个句子的意思是“1914年汽车和卡车一共生产了469,000辆，而1929年两倍的卡车下了生产线”，句子前后并没有直接逻辑联系，前面句子并没有讲卡车有多少辆；trucks themselves这样的结构（X itself）中，themselves反身代词是对trucks的同位语，表示强调是trucks而已，我们往往可以看作没有反身代词，就如同同位语往往与句子主成份无关一样。
E. as many trucks错误同D；by themselves错误同C

Choice A uses the clause that is. Usage of present tense verb suggests that the said gross national product is currently bigger than that of the countries mentioned in the sentence.

But the sentence intends to present just a hypothetical calculation that does not exist.

E选项解释太牵强了吧。。
以下是我的曼哈顿笔记，供参考。
▲Use WHICH only to refer to nouns—never to refer to an entire clause.
▲Always test which clauses to make sure that the which refers to the closest preceding main noun and not the whole clause.

例子：
Wrong: Crime has recently decreased in our neighborhood, WHICH has led to a rise in property values.
Right: Crime has recently decreased in our neighborhood, leading to a rise in property values.

D肯定不对“for”后面跟的是被奖励的行为，“recognition of their outstanding bravery.”不是被奖励人的行为。

E. Unlike比较双方不可比；前面there be句型是主系表结构，所以后面contributing不能表示伴随结构，而是作为形容词修饰前面的名词catching monkfish；用because引导的原因状语从句来表示方式太过于累赘。

不， 我觉得E选项的解释完全不对。 我在其他网站上看到这个，更愿意相信这个，复制过来给大家看看
”which will 就远修饰a board of high pressure, 因为谓语builds很短。不然句子就要变成：while a borad area of high pressure, which will bring fair and dry weather for several days, builds.了， 头重脚轻。 ----by IrisH ”
我觉得这个解释非常讲得通，之前就接触过 名词非就近修饰的问题， 当谓语动词比较短的时候， 定于从句可以跳跃修饰，比如说：
a new CEO has been hired who….
希望这个答案对大家有帮助。学习gmat坚信了太久which不能指代一个句子，不愿意被这样奇奇怪怪不负责任的解释推翻。

错选c，og上对c的解释是‘especially if it has worked well in the past‘ it 指代不明.
曼哈顿第75页说’an adverbial modifier points to the right verb or clause as long as it is not structurally closer to some other verb or clause. an adverbial modifier dose not necessarily have to be placed as close as possible to what it modifies'

关于a选项，简化：commitment makes it likely to miss signs of ....
换语序变成：commitment makes to miss signs of... likely
这样看it不就是作为宾语，叫做形式宾语吗？

第一件事：some specific type of winds will continue to usher in a seasonably cool air mass into the region.
第二件事： building of a broad high pressure area in that same region.
第三件事： leading the way for fair and dry weather for several days.
第一件事和第二件事是同时发生的，只有A和E表示出了这个关系。而第二件事导致第三件事情发生，只有E表达了这层关系。

With no natural predators and expanses of green suburban neighborhoodsde 逻辑主语是 the deer population，排除ABDE

A. with no A and B 歧义。
B. 主句逻辑意思错误, estimate of the deer population in New Jersey has grown 逻辑语义错误
D. 错误同A
E. estimate 用法错误。

them指代错误，分好后加句子

在最后c和e的排除中，发现must会导致两个that从句后不平行

做题还是不要快，语义一定要理解

A: when placed的逻辑主语是production而不是邻近的mice，句意错；动名词growing和increasing应该改成名词growth，increase

B: they指代不明，可以指代brains或mice；第二个they和第一个they不是一个对象

其实只有that没有指代不明，就近修饰mice
C: they指代brains不对；第二个they和第一个they不是一个对象

D: when placed的逻辑主语是production而不是邻近的mice，句意错；

E: correct

A: when placed的逻辑主语是production而不是邻近的mice，句意错；动名词growing和increasing应该改成名词growth，increase

B: they指代不明，可以指代brains或mice；第二个they和第一个they不是一个对象

其实只有that没有指代不明，就近修饰mice
C: they指代brains不对；第二个they和第一个they不是一个对象

D: when placed的逻辑主语是production而不是邻近的mice，句意错；

E: correct

排除of solving只有b可以平行

错选A 还是因为句意问题

错选A 因为没看懂句意