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题库 / OG2016-SC-2
Hurricanes at first begin traveling from east to west, because that direction is the way the prevailing winds in the tropics blow, but they then veer off toward higher latitudes, in many cases changing direction toward the east before dissipating over the colder, more northerly waters or over land.
Hurricanes at first begin traveling from east to west, because that direction is the way the prevailing winds in the tropics blow, but
At first, hurricanes travel from east to west, because that is the direction of the prevailing winds in the tropics, but
While hurricanes travel from east to west at first, the direction of the prevailing winds blowing in the tropics, and
Because hurricanes at first travel from east to west, since it is the direction of the prevailing winds in the tropics,
Hurricanes, beginning by traveling from east to west, because this is the direction of the prevailing winds in the tropics,
题目分析：总体来说本题难度不大，很多选项可以根据基础的语法知识点进行快速排除。
选项分析：
A选项：begin的意思是“开始”，at first的意思是“起初”。两者的意思在本句中几乎是一样的，因此其中一者必然是赘余的。because后从句的语法结构可能有点难懂。这是一个主系表结构的句子，the way是表语，其身后是一个定语从句。在语法上，当先行词是way时，定语从句经常会省略关系词。还原为正常的从句则有：
that direction is the way in which the prevailing winds in the tropics blow
B选项：Correct. 本选项在语法和逻辑上均是正确的。that是一个代词，这里的指代对象是east to west，中文可以翻译为“那”。
C选项：and是并列连词，一定要连接两个完整的句子（有时会由于省略的现象使得它看起来不是连接句子的，但实质上依然是连接句子。例如：Jack and I went to school。例句中的and真正连接的应该是：Jack went to school and I went to school）。让我们来分析一下本选项的句法结构：首先While hurricanes travel from east to west at first是状语从句，the direction of the prevailing winds blowing in the tropics中没有谓语动词，只能看作一个名词短语，and身后是完整的句子。这造成了严重的语法错误，即，and身前没有主句。
D选项：hurricanes at first travel from east to west和they then veer off toward higher latitudes之间不应该是因果关系，而应该是转折关系；另外，本句在语法结构上也不正确，because应该引导一个原因状语从句，since也会引导一个原因状语从句，理论上两者应该各自摆在距离自己主句最近的地方，如果两者同时修饰一个主句，则应该分别摆在这个主句的两端，不能像本选项一样放在一起。
E选项：本选项开头已经出现了主语hurricanes，在出现谓语动词前又出现了一个主语they，相当于在语法上多了一个主语they。
at first副词，=at the beginning，首先。有了at first，不再用begin
AT FIRST VS BEGIN 重复
B的that指代west，勉强让他过
一个类似的例子，也是来自OG
Severely hindered by problems with local suppliers, the AQ division also had to adapt to a new management team, but this was not seen by the board of directors as a legitimate excuse for such low productivity.
Manhattan里面不是说this that不能裸奔吗？疑惑了
我也疑惑这点
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这是一个主系表结构的句子，the way是表语，其身后是一个定语从句。在语法上，当先行词是way时，定语从句经常会省略关系词。还原为正常的从句则有：
that direction is the way in which the prevailing winds in the tropics blow
at first begin 重复
A，that direction is the way the winds blow，方向是方式，语意错误；同时the way the winds blow构成同位语，缺少介词，the winds blow in a way
1、hurricanes travel from east to west，from east to west可以看成介宾短语做状语修饰travel,how travel? travel from east to west
关于代词的指代问题：代词通常指代核心词，但这不是死板的规定。所有格里的名词、介宾短语里的名词也是可以被单独指代的，如:Jim's bag is too heavy to him.him指代Jim's里的Jim；He lives in China and that's also his motherland. that指代in China里的China.
2、关于then的用法：
then是副词，不是连词，所以if/then可以同时出现
then可以单独使用，A do B, then do C,也可以at first/then一起用；或
Hurricanes at first begin traveling，then……，风一开始从东往西刮，然后从南往北刮。
1.選項中 ,but ..., 應把此句當插入句看
2.絕對考點:1. they指代對象應為hurricanes 2. sentence fragment
3.相對考點: 1."At first begin" is redundant 2. direction = way ,redundant
B选项，根据manhattan语法：on the gmat ,do not use THAT or THOSE in place of nouns, unless you modify THAT or THOSE to make them new copies. 所以B里的THAT应该是错的啊？
代词
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B选项，根据manhattan语法：on the gmat ,do not use THAT or THOSE in place of nouns, unless you modify THAT or THOSE to make them new copies. 所以B里的THAT应该是错的啊？
that可以裸奔？
我记得啥啥啥笔记里写的that只能在that of XXX （比较，前面有出现同等词）的情况下，that才能裸奔。除此情况之外，that与this一样，不能裸奔啊。
that 可以裸奔吗？
There is no issue in such a reference because east to west is a noun entity that can be referred to by a pronoun THAT
A选项：at first 和begin－redundant; that direction is the way the prevailing winds in the tropics blow冗杂了，that is the direction of.../ that is the way of ...更简明；
C选项：While hurricanes travel from east to west at first是状语从句，the direction of the prevailing winds blowing in the tropics中没有谓语动词，只能看作一个名词短语，and身后是完整的句子。这造成了严重的语法错误，即，and身前没有主句。
D选项：hurricanes at first travel from east to west和they then veer off toward higher latitudes之间不应该是因果关系，而应该是转折关系；另外，because应该引导一个原因状语从句，since也引导状语从句
E选项：没有main verb
A选项赘余
老师，because 和but可以出现在同一个句子中吗
老师，像A选项通过赘余排除，这个算作在GMAT考试中一个排错的标准么？谢谢！
算的，GMAT要求语言要简洁
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A at first和begin 累赘
B that 可以单独指代
A.除了begin和at first重复；OG解释一个小点：direction和way意思一样，wordy