98Even though, although, and while introduce clauses that appear to be logically incompatible but in fact are not.虽然，虽然，虽然引进条款，似乎在逻辑上是不相容的，但事实上并非如此。
In this sentence, the apparent incompatibility that must be clearly expressed is that although the spear points are named for a particular place in New Mexico, they are in fact found throughout North America.
Because their discovery took place in 1932 and is not ongoing, the correct verb tense is simple past, not present perfect. 因为他们的发现是在1932年举行，而不是持续的，正确的动词时态是一般过去，不是现在完成时。
Even though Clovis points, spear points with longitudinal grooves chipped onto their faces, have been found all over North America, they are named for the New Mexico site where they were first discovered in 1932.就算这个point在北美洲到处都有，但是它仍然被命名为Mexico site
A Correct. The even though clause expresses clearly that the seeming incompatibility is between where the spear points have been found (all over North America) and the naming of the spear points for a single site in New Mexico.
(B) Although named for the New Mexico site where first discoveredin 1932, Clovis points are spear points of longitudinal grooves chipped onto their facesand have been found all over North America
B The sentence structure indicates that the expected incompatibility is between the geographically based name of the points and their physical properties, which makes no sense; where discovered is missing a subject—the correct form is where they were first discovered.句子结构表明，预计不相容点之间的地理名称和他们的物理性质，这是没有意义的，那里发现的是缺少一个主题的正确形式是他们首次发现。作者: 朵拉V 时间: 2010-6-24 17:01
对比对象错误
C Have been first discovered is the wrong tense, since the discovery is a discrete event completed in the past. 已被首次发现是错误的紧张，因为发现是一个不连续的事件在过去完成。
(C) Named for the New Mexico sitewhere they have been first discovered in 1932, Clovis points,spear points of longitudinal grooves chipped onto the faces, have been found all over North America.
they have been first discovered VS have been found
关键是“first”首次发现，即是一次性动作而不能持续
D The sequence of information in this sentence is confusing; even though and but both introduce information that is contrary to expectation, so to use them both to describe a single apparent contradiction is redundant and nonsensical.在这句话中的信息序列混乱，即使和介绍资料，但两者是相反的期望，所以他们都用一个单一的描述显然是多余的和荒谬的矛盾。作者: 朵拉V 时间: 2010-6-24 17:04
(D) Spear points with longitudinal grooves that are chipped onto the faces, Clovis points,even though named for the New Mexico site where first discovered in 1932, but were found all over North America.
even though but
E While introduces a description of Clovis points and suggests that this appears incompatible with their appearance all over North America, which makes no sense; have been first discovered is the wrong tense.
