‘remainder' and 'balance' mean 'the rest of the stuff'. in other words, these words exist specifically to convey the notion of 'NOT everything'.

主谓一致排除BCE
D，with部分作状语，但是两句话间并不存在修饰关系，
A correct

选项e应该是the rest of the 30 inches，the rest+整体
E.g., Here is $100. Buy gas for your trip, and then use the rest of the $100 to buy food.
"”> Note how this works. $100 is the total. The amount you'll have to spend on food is not $100, but $100 minus $(whatever you pay for gas).
balance，rest作主语，谓语用单数，e中应该用balance

remainder，是单数，所以谓语动词contribute也应该为单数。

'remainder' and 'balance' 表示余下的部分， the rest of X表示X就是整体
"the rest of the 9 inches". This construction implies that 9 inches is the total.
E.g., Here is $100. Buy gas for your trip, and then use the rest of the $100 to buy food.
"”> Note how this works. $100 is the total. The amount you'll have to spend on food is not $100, but $100 minus $(whatever you pay for gas).

错选E，注意主谓一致，the rest of是单数，所以后面的动词需要用第三人称单数”contributes“

又错一次
B选项：even though连接的两个小句必须呈现转折关系。在本题中，“土壤和植物中的蒸发大概将21 inch还给大气”和“剩下的9 inch会提供给河流”之间应该仅仅是同时发生的两件事，两者之间并没有强烈的转折关系，因此需要用while而不是even though。另外，the remainder of 9 inches contribute to the flowing of streams and rivers这句话的主谓不一致。其主语为remainder，是单数，所以谓语动词contribute也应该为单数。

选项e应该是the rest of the 30 inches，the rest+整体
E.g., Here is $100. Buy gas for your trip, and then use the rest of the $100 to buy food.
"”> Note how this works. $100 is the total. The amount you'll have to spend on food is not $100, but $100 minus $(whatever you pay for gas).
balance，rest作主语，谓语用单数，e中应该用balance

rest和balance的区别
The real problem with D is "the rest of the 9 inches". This construction implies that 9 inches is the total.
E.g., Here is $100. Buy gas for your trip, and then use the rest of the $100 to buy food.
"”> Note how this works. $100 is the total. The amount you'll have to spend on food is not $100, but $100 minus $(whatever you pay for gas).

balance主语，谓语用单数

D，with transpiration from soil and from plants to return approximately 21 inches to the atmosphere是一个独立主格结构。我们至少需要将其中的不定式短语to return approximately 21 inches to the atmosphere改为分词短语returning approximately 21 inches to the atmosphere，这点考查了不定式和ing的区别。用之于本题，主句the rest of the 9 inches contributes to the flow of streams and rivers和return句分属两个不同的方面（水的两个去处），所以主句的发生不会引起从句状态的改变，应选择非不定式的选项。

如果没有balance和rest，带有数字的通常谓语动词用单数。
D选项with...to表示anticipated events, 但是这句话应该表示一般现在时。the rest of 9错误，应该用balance.

'remainder' and 'balance' mean 'the rest of the stuff'. in other words, these words exist specifically to convey the notion of 'NOT everything'.

The real problem with D is "the rest of the 9 inches". This construction implies that 9 inches is the total.
E.g., Here is $100. Buy gas for your trip, and then use the rest of the $100 to buy food.
"”> Note how this works. $100 is the total. The amount you'll have to spend on food is not $100, but $100 minus $(whatever you pay for gas).
the balance和the remainder表示的是余额

if you've got a fraction of NOUN or a percentage of NOUN, you retain the singular/plural nature of NOUN.
so, since "students" is clearly a plural noun, so is "x% of students". since "precipitation" is clearly a singular noun, "50% of the precipitation" would also be a singular noun.

A选项最值得注意的地方难道不是BALANCE 做了CONTRIBUTES的主语吗？这在GMAT语法上来说不是不合逻辑的吗？？？？？？？？

The real problem with D is "the rest of the 9 inches". This construction implies that 9 inches is the total.

E.g., Here is $100. Buy gas for your trip, and then use the rest of the $100 to buy food.
"”> Note how this works. $100 is the total. The amount you'll have to spend on food is not $100, but $100 minus $(whatever you pay for gas).

因为对独立主格真的超级超级讨厌，所以特地上曼哈顿看解释，这个完全是从意思角度出发，真的超厉害

毕老师讲的好清楚

请问这道题flow为什么优于flowing呢？

谢谢老师！