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题库 / OG2019-SC-757
To map Earth's interior, geologists use a network of seismometers to chart seismic waves that originate in the earth's crust and ricochet around its interior, most rapidly traveling through cold, dense regions and slower through hotter rocks.
interior, most rapidly traveling through cold, dense regions and slower
interior, which travel most rapidly through cold, dense regions, and more slowly
interior, traveling most rapidly through cold, dense regions and more slowly
interior and most rapidly travel through cold, dense regions, and slower
interior and that travel most rapidly through cold, dense regions and slower
题目分析：
略
选项分析：
A选项：slower不正确。由于本句中的slow是在描述地震波传播的速度的，所以其应该修饰travel这个动词，应该用副词的slowly，而不是slower这个形容词。
B选项：which是一个定语从句，应该就近修饰一个名词。由于这里travel是复数，但其身前几乎没有复数名词，因此该定语从句没有先行词。（waves虽然是复数，但是和这个定语从句之间隔了一个层级，无法修饰到该名词）
C选项：Correct. 本选项在逻辑和语法上均是正确的。现在分词短语traveling most rapidly through cold, dense regions是伴随状语，就近修饰waves ricochet around its interior这个句子，travel的逻辑主语为waves。
D选项：travel和ricochet做为合句不正确，应让travel做伴随状语。这是因为，合句是并列关系，状语是从属关系，本题中，“地震波在冷的条件下更快”是“地震波在内层跳动”的一个属性，即，跳动这个行为的速度属性。因此，两件事只能是从属关系，而不能是并列关系。另外，slower错误同(A)。
E选项：本选项错误同(D)。
here, that action is '...ricochet around [the earth's] interior.'
the subject of THAT action is 'seismic waves', and so 'comma + _ing' works perfectly in the usual way.
e.g., both of these sentences work in the same way:
A drunk driver drove his car into a storefront, causing several hundred thousand dollars' worth of damages.
A verdict is due today in the trial of a drunk driver who drove his car into a storefront, causing several hundred thousand dollars' worth of damages.
in general, when modifiers modify actions, they just modify the closest action -- regardless of whether that action is actually a verb.
e.g.,
I made weird expressions with my mouth and fingers, scaring the babies.
My sister saw me making weird expressions with my mouth and fingers, scaring the babies.
both of these sentences are ok, and both of them work in exactly the same way. the fact that "making" isn't grammatically a verb doesn't make any difference -- and it would be silly to make rules based on that distinction.
https://www.manhattanprep.com/gmat/forums/sc-imported-into-massachusetts-form-europe-t7278-30.html
有点难判断题目是不是想考就近修饰（因为先行词没有发生像老师上课说的在不同选项间置换），作题时反而容易误解为题目是想考伴随的主句"主语"（geologist）是否可以执行该动作（毕竟还有跳跃修饰。。。），请问这里"主句"该如何定义呢？谢谢
这个其实咱们课上讲过～在考虑修饰的时候，咱们讲的主句，不是整体题目的主句，而是这个修饰部分修饰的句子。修饰的原则是就近修饰，所以这里traveling的主句是ricochet～自然，它的主语也和ricochet的主语一致。登录 或 注册 后可以参加讨论
我也想知道。。伴随状语的主语不应该是主句的主语吗
svo that svo结构里，v-ing可以修饰小的svo的主语登录 或 注册 后可以参加讨论
,
comma ing modifies the closest action
错选A slow修饰travel 应该用slowly
b：which 应该做wave 定语从句，但中间又隔了一个定语从句的层级 ，无法就近修饰
d和e 逻辑关系错误 slower 错误 两句是从属关系，不是并列
2.which是一个定语从句，应该就近修饰一个名词。
3.travel和ricochet做为合句不正确，应让travel做伴随状语,合句是并列关系，状语是从属关系.
C选项：Correct. 本选项在逻辑和语法上均是正确的。现在分词短语traveling most rapidly through cold, dense regions是伴随状语，就近修饰waves ricochet around its interior这个句子，travel的逻辑主语为waves。
ing 伴随状语；形容词，副词的区别；
traveling 的逻辑主语是waves，可以这样用；
后：各选项的区别，slower和more slowly，形容词比较级和副词比较级的区别，修饰的都是travel动词，肯定用more slowly，而不是slower
-读懂句意，后面的主语是地震波wave，描述的是地震波的generate和travel