SAT两道语法题!1.Aloe vera is a succulent (plant from whose leaves are extracted) a gel that has been prized since ancient times for its medicinal properties.A.plant from whose leaves are eextracted B.plant from whose leaves is extracted C.plant from whose leaves they extrat D.plant,from its leaves is extracted E.plant with leaves for extracting 为什么答案是B?有人说这道题倒桩回来是“Aloe vera is a plant from whose leaves a gel [that has been prized since ancient times for its medicinal properties] is extracted.”,这个是对的吗?如果是的话,leaves和a gel不就是从句的两个主语了吗?怎么去翻译?2.(Two basic types of carbohydrate,the simple carb,) identified by its sweet taste,and the plex carb,which has a pleasant taste but is not sweet.为什么答案是Two basic types of carbohydrate are the simple carb?而不是Two basic types of carbohydrate are the simple carbs?或者是Of two basic types of carbohydrate the simple carb? 英语
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【答案】 1、我把原句说的东西分解成几句话,你可能就容易懂了：
（1）Aloe vera is a succulent plant.
（2）A gel is extracted from the leaves of Aloe vera.
（3）The gel has been prized since ancient times for its medicinal properties.
意思是说,Aloe vera 是一种多汁植物,（人们）从它的叶子里提取一种胶,这种胶自古就因其药用价值而被视为珍品.
现在把第二句和第三句连起来：
A gel [that has been prized since ancient times for its medicinal properties] is extracted from the leaves of Aloe vera.（方括号里是定语从句）
再把第一句和这个连起来：
Aloe vera is a succulent plant from whose leaves a gel [that has been prized since ancient times for its medicinal properties] is extracted.（通过from whose leaves 构成定语从句,把它们连接了起来）
但是现在这个句子的后半部是一个很长的定语从句,而这个定语从句有一个巨大的主语,为了让句子看起来更平衡,就把这个定语从句里边的结构做以倒装,即：把is extracted移到前边来,而把那个漫长的带定语的主语移到后面,于是就成了B选项的样子：
Aloe vera is a succulent plant from whose leaves is extracted a gel that has been prized since ancient times for its medicinal properties.
能理解吗?这个问题说起来很绕,如果我仍然没说明白请再追问,我再换个说法试试.
2、这个句子比上一个容易理原句缺谓语动词,加了are之后的主干是 Two basic types of carbohydrate are the simple carb...and the plex carb...这样就合理了.理解了这个,你应该就明白你说的那两种为什么不合理了吧?