中应该是will be able to与at low cost平行,后面的will be省略)103. The development of a new jumbo rocket that is expected to carry the United States into its next phase of space exploration will be able to deliver a heavier load of instruments into orbit than the space shuttle and at a lower cost.
(A) The development of a new jumbo rocket that is expected to carry the United States into its next phase of space exploration will be able to deliver a heavier load of instruments into orbit than the space shuttle and at a lower cost.
(B) The development of a new jumbo rocket is expected to carry the United States into its next phase of space exploration and be able to deliver a heavier load of instruments into orbit at a lower cost than the space shuttle.
(C) The new development of a jumbo rocket, which is expected to carry the United States into its next phase of space exploration, will be able to deliver a heavier load of instruments into orbit at a lower cost than the space shuttle.
(D) A newly developed jumbo rocket, which is expected to carry the United States into its next phase of space exploration, will be able to deliver a heavier load of instruments into orbit than the space shuttle can, and at a lower cost.
(E) A newly developed jumbo rocket, which is expected to carry the United States into its next phase of space exploration, will be able to deliver a heavier load of instruments into orbit than the space shuttle and to cost less.
选C？
还没碰到这个题
JC相对于SS来说能用更少的成本运送更多的设备，C哪个地方错了？是否是两个比较级导致不知道than的是哪个的问题??
在c中，than是指heavier,不是lower cost，所以d是正确答案
接上一个
而且jr 与 ss 是平行关系
D感觉是说rocket把美国带到了...，就是说把整个美国装进去，好像说不通哦。
有OG11th的朋友能不能提供一下官方解释，谢谢！
有这么多人新加入讨论，好现象！
我有个疑问，DE我挣扎了很久．区别就是最后at low cost,和cost less.
问题：d是不是into obit 和 at low cost平行呢？
那E 中，cost less 和dilever 也可以平行啊？
与楼上同问(PS中应该是will be able to与at low cost平行,后面的will be省略)
同样在DE间挣扎了好久,可为什么to cost less不对呢??就算他和to dilever并列好象也不存在错误啊!
疑惑中!!
一看原贴，说答案是C, 差点pass out。后来才看到后面那个问号. 
. 我也说是D
谈谈个人对E的想法：E can cause discrepancy:
1. rocket...will be able to deliver a heavier load of instruments into orbit than the space shuttle. 变成rocket可以把instructions送入orbit和送入space shuttle,这两者比。
D用了can，就很明确是两主语rocket和space shuttle之间比了。
而且D中a lower cost和a heavier load 平行。E中 to deliver 和to cost 平行, cost 这样用是动词，但这里没有宾语，to cost "Who" less? cost space shuttle less? cost rocket less? 意思上看是cost United States less? 但"United States" 在前面, 离得太远了。 就是ETS最喜欢说的"oject is not immediately clear".
还有seasnow说的rocket把美国带到了... 我也觉得看得胃里痒痒的。觉得像B那样，developement...is expected to carry the US比较好，但B也没有Can，所以还是D好。
我是新手，有错的地方，请！！！
我觉得D和E的差别在于意思上。
不是要去cost less，而是要使之at a lower cost。
在c中，than是指heavier,不是lower cost，所以d是正确答案
c中是development和SS比较了,而D中是Cr和ss比较.c比较对象错了,所以d对. 对吗?
我觉得D和E的差别在于意思上。
不是要去cost less，而是要使之at a lower cost。
同意，一个做成主句了，一个是介宾短语，肯定是后者了。
今天OG11才寄到. 等了一个月. 汗.
OG11th 答案: D.
E: Verb can is needed after space shuttle to create a correct comparison; to cost less is confusing because it seems to parallel to to deliver.
A newly developed jumbo rocket, which is expected to carry the United States into its next phase of space exploration, will be able to deliver a heavier load of instruments into orbit than the space shuttle can, and (will be able to deliver a heavier load of instruments into orbit) at a lower cost.
是不是这个意思？
请大家指教！！
OG 11 答案 分析
A-The subject should be the rocket,not its development,verb can is needed after space shuttle to create a correct comparision;that should be replaced by which and the clause should be set off with commas
B-The subject should be the rocket,not its development,verb can is needed after space shuttle to create a correct comparision
C-The subject should be the rocket,not its development,verb can is needed after space shuttle create a correct comparision.
D-best. The rocket is the subject of his sentence;the comparision between rocket and the shuttle is clear;the nonrestrictive clause is correctly introduced and punctuated.
E-Verbe can is needed after space shuttle to create a correct comparision;to cost less is confusing because it seems to parallel to deliver.
OG 11 答案 分析
A-The subject should be the rocket,not its development,verb can is needed after space shuttle to create a correct comparision;that should be replaced by which and the clause should be set off with commas
B-The subject should be the rocket,not its development,verb can is needed after space shuttle to create a correct comparision
C-The subject should be the rocket,not its development,verb can is needed after space shuttle create a correct comparision.
D-best. The rocket is the subject of his sentence;the comparision between rocket and the shuttle is clear;the nonrestrictive clause is correctly introduced and punctuated.
E-Verbe can is needed after space shuttle to create a correct comparision;to cost less is confusing because it seems to parallel to deliver.
A newly developed jumbo rocket, which is expected to carry the United States into its next phase of space exploration, will be able to deliver a heavier load of instruments into orbit than the space shuttle can, and (will be able to deliver a heavier load of instruments into orbit) at a lower cost.
是不是这个意思？
请大家指教！！
我觉得：A newly developed jumbo rocket, which is expected to carry the United States into its next phase of space exploration, will be able to deliver a heavier load of instruments into orbit than the space shuttle can, and （will be able to deliver at a lower cost than space shuttle can）请指教
103. The development of a new jumbo rocket that is expected to carry the United States into its next phase of space exploration will be able to deliver a heavier load of instruments into orbit than the space shuttle and at a lower cost.
(A) The development of a new jumbo rocket that is expected to carry the United States into its next phase of space exploration will be able to deliver a heavier load of instruments into orbit than the space shuttle and at a lower cost.
(B) The development of a new jumbo rocket is expected to carry the United States into its next phase of space exploration and be able to deliver a heavier load of instruments into orbit at a lower cost than the space shuttle.
(C) The new development of a jumbo rocket, which is expected to carry the United States into its next phase of space exploration, will be able to deliver a heavier load of instruments into orbit at a lower cost than the space shuttle.
(D) A newly developed jumbo rocket, which is expected to carry the United States into its next phase of space exploration, will be able to deliver a heavier load of instruments into orbit than the space shuttle can, and at a lower cost.
(E) A newly developed jumbo rocket, which is expected to carry the United States into its next phase of space exploration, will be able to deliver a heavier load of instruments into orbit than the space shuttle and to cost less.
选D
问题是关于后面的, and at a lower cost
1 , and 前面的逗号不要行不行，关于这个逗号 一直不清楚究竟两个平行AND前要不要逗号
2 如果把省略的补出应该是什么
A newly developed jumbo rocket, which is expected to carry the United States into its next phase of space exploration, will be able to deliver a heavier load of instruments into orbit than the space shuttle can, and will be at a lower cost than the space shuttle will be .
我补出的对吗？？？
2 如果把省略的补出应该是什么
A newly developed jumbo rocket, which is expected to carry the United States into its next phase of space exploration, will be able to deliver a heavier load of instruments into orbit than the space shuttle can, and will be at a lower cost than the space shuttle will be .
我补出的对吗？？？
我觉得补出部分应该是
will be able to deliver at a lower cost than the space shuttle can
以较低的成本运送
我的问题是：平行的时候，如何省略？？？？
我的问题是：平行的时候，如何省略？？？？
楼上的，《张道真实用英语语法》P584讲“并列句中的省略”时说到：并列句中，如果后面分句有词和前面分句的词相同，有时可以省略，以避免重复。例句：She could have applied for that job, but she didn't.
OG11解释：That is used to introduce restrictive clauses; such clauses are essential to the meaning of a sentence. The that is expected ... exploration clause is not essential; it should be introduced by which and set off with commas.
感觉句中的信息是否重要好像是ETS说了算的...
不知如何去判断是用限制性还是非限制性？请NN指教
根据章振邦语法书上的解释，非限制性定语从句就是拿掉也不影响先行词意义的表达的，而限制性定语从句拿掉了先行词就表意不清了。
白勇的GMAT语法全解中对这套题有说明：
介词短语at a lower cost就近修饰动词to deliver, a rocket will be able to deliver sth. at a lower cost, 逻辑搭配合理；
另外，比较从句than the space shuttle can补出表示一般现在时的情态动词can, 与表示一般将来时的will be able to 比较。
这道题我想了很久，主要在de之前徘徊
排除be able to 和can并列，助动词尽量补出原则
to cost less 和to deliver 为什么不能并列，并列也可以讲得通我一直不可以接受og的解释
现在我的理解是d选项的意思是jr 执行deliver a heavier load of instrumentsinto orbit这个动作成本较低
而e选项则是jr这个东西的成本较低
不知道这样理解对吗?
回答楼上的。是的。
证据：就在E选项的解释里。verb can is needed after space shuttle to creat a correct comparison。
为什么不用do呢？当然是错误的。
MM就当公式记忆了吧。
好吧……也只能这样了
多谢！
同问！
为什么 to cost less 不能和 to deliver 对应呢？语义和逻辑上也读得通的呀？
nn指教
应该选D，这句话得通过理解句子意思，到底是development还是new jumbo rocket be able to deliver a heavier load of instruments into orbit,当然是火箭了，所以A，B，C错。至于D和E，要看比较对象是否对等，D中在than的后面补出了can，使句意更明确。不是火箭和space shuttle比较，而是他们装载量的能力的比较。所以选D
OG 11th的官方解释
The challenge here is to revise the sentence and present a complex idea as simply as possible.What will deliver the instruments in to orbit? They will be delivered not by the development of a rocket but rather by the rocket itself; the jumbo rocket, not its development, must be the subject of the sentence. The phrase a heavier load of instruments than the space shuttle suggests a comparison between the load of instruments and the shuttle, whereas it is actually the different capabilities of the rocket and the shuttle that are being compared. The comparison should be written: the jumbo rocket will be able to deliver a heavier load…than the space shuttle can. That is used to introduce restrictive clauses; such clauses are essential to the meaning of a sentence. The that is expected…exploration clause is not essential; it should be introduced by which and set off with commas.
我的思路：
主语（development/rockets）that is expected…… will be able to……
ABC和DE的区别：主语不同，结合谓语的delieve，development不能送火箭上天，rockets可以，排除ABC。
can不可省，否则后面只有the space shuttle，比较结构形式上不对称，排除E。
我的问题：
B项，and错，我觉得这个错很明显，都改变原意了阿，为何解释里没提到呢？
我的新东方笔记：to deliver 和 to cost less 平行不对，因为be able to cost 的用法是错的
at a lowe cost前省略了to deliver.
E选项中，to cost less如果和to deliver平行，逻辑上讲不通。
同问楼上！！！
why the comma is here just before “and”？？？
It is important for me to figure out the right answer.
同问. and后面可以没有任何主谓并且前面有逗号么?
研究了两天，有点新发现。
逗号后面的部分不应该算作一个省略的句子由and与be able to deliver ……并列，这样就不能解释为什么会有逗号了。
另一种可能的解释是逗号后面的部分是一个伴随状语而已，而不是句子。为什么说是伴随呢？因为此句强调rocket能够deliver更多负载这一个动作，同时的一个伴随结果是价钱也更低。而用并列句的话，强调rocket能够载更多货物，rocket本身的造价也更便宜两个动作（补出省略部分是rocket （will be） at a lower cost），这样即改变了句意又不能解释逗号了。
我在想(D)选中的 , and at a lower cost中的逗号只是为了方便区隔前一句的heavier…than的比较而补出的，事实上根据句意的确是, and be able to deliver at a lower cost的省略
至于第43楼说的be able to cost这个句型是错？
道理在哪？
可否说明一下
我也是这样把D排除掉的，我觉得可以是看成是省略，这样就不会是fragment了，就是省略了and (js will be able to deliver)at a lower cost, 但是我感觉and前的，去掉更好
这是我找来的另一个句子，For example, social security and workers' compensation programs are designed to provide benefits quickly and at
low
cost.
这道题我想了很久，主要在de之前徘徊
排除be able to 和can并列，助动词尽量补出原则
to cost less 和to deliver 为什么不能并列，并列也可以讲得通我一直不可以接受og的解释
现在我的理解是d选项的意思是jr 执行deliver a heavier load of instrumentsinto orbit这个动作成本较低
而e选项则是jr这个东西的成本较低
不知道这样理解对吗?
哇！！豁然开朗，很道理呢！！
不过还是不明白and之前那个逗号
我觉得补出部分应该是
will be able to deliver at a lower cost than the space shuttle can
以较低的成本运送
E中 to cost less 和 to deliver 并列 变成 Rocket will be able to deliver a heavier
load.. and will be able to cost less. 改变了原文的意思
原文不是指JR cost
less than SS. 而是指
JR will be
able to deliver a heavier load at a lower cost than SS can
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