有OG SC 36解释看不懂，也搜不到相关的解释！请大家帮我看一看！
36. Bufo marinus toads, fierce predators that will eat frogs, lizards, and even small birds,
are native to
attempt to control pests in the state's vast sugarcane fields.
(A) are native to
an attempt to control
(B) are native in
attempts to control
(C) are natives of
an attempt at controlling
(D) had been native to
(E) had been natives of
Choice A is best. The phrasing are native to correctly suggests that the toad species is indigenous to, and still exists in,
答案没有问题，我也觉得用in更好，但对OG上述AS的解释看不明白。
原题的主干为BM are...but were introduced into
AS在这里应该是做介词，表示作为/当作的意思，解释说BM were introducted
AS在这里应该是做介词，表示作为/当作的意思，解释说BM were introducted
as an attemp不对，因为the attempt不包括BM本身，而是BM的引进。
是否AS在做此用法的时候不能用于被动语态呢？如果改为people introduced
BM as an attempt又对不对呢？另有：
OG 37. While some academicians believe that business ethics should be integrated into every business course, others say that students will take ethics seriously only if it is taught as a separate, required course.
39. For members of the seventeenth-century
(A) a method to protect
(B) as a method protecting
(C) protecting
(D) as a protection of
(E) to protect
Choice C is best because the participle protecting begins a phrase that explains what the shields did. Choices A and B awkwardly use the singular word method to refer to items of military equipment rather than to the use of such items. Also, a method of protecting would be more idiomatic than a method to protect in A or a method protecting in B（a method of protecting中）. In B and D, as is incorrect; also, a protection in D has no noun for which it can logically substitute. Choice E is incomplete; used to protect would have been acceptable.
从这几道题，我有几点疑惑：
从这几道题，我有几点疑惑：
1、as 在表示“作为某种身份/角色等”的时候可以用被动语态，而在表示“作为某种目的/功能等”的时候不能够用于被动？
1、as 在表示“作为某种身份/角色等”的时候可以用被动语态，而在表示“作为某种目的/功能等”的时候不能够用于被动？
2、as做介词表示“作为目的/功能”的
2、as做介词表示“作为目的/功能”的
时候，如果放在句尾，不能用逗号和前面的句子隔开（a protection in D has no noun for which it can logically substitute.如何讲？）？而在表示“作为某种身份/角色等”或者"当某人是（某身份）"时可放在句首，用逗号和主句隔开？eg：As a child, she was sent to six different schools.这个问题提得好啊，as的用法确实很多，很杂，我谈谈个人意见：
37, 39 其实都说了一个问题，句中as表示“作为...”“当作...”的意思，也可以说表功能、目的吧
简单形式就是 A as B ，把A当作B，B 就是A逻辑上的一个替换物，39题这段解释可以明证 a protection in D has no noun for which it can logically substitute.
所以 BM as an attempt 为什么不对？ 因为逻辑上BM的引进才可以说被当作是一种尝试，而不是BM本身。37的解释你画红线的部分也很清楚的说明了这一点， Both as attempts in B and E and as an attempt in D are wrong because the attempt consists not of the toads themselves, but of their introduction into the environment.
另外，我觉得as没有所谓主被动问题，你举例的最后一句话 As a child, she was sent to six different schools. 我认为as不是介词作为某个角色的意思，而是连词表示when的意思，从句中省略了主谓。 还原应该是 As she was a child, she was sent to six different school. 呵呵，你不觉得这样理解起来更顺畅一些吗？
解释不当的，请各位NN继续指教！
（不是NN，大家讨论）我觉得考的就是as当介词“作为”讲的时候，前后两个名词应该是对称的（性质，形式等）。
As a child, she was sent to six different schools.这里的she就是一个child.
而我们不能说36中的BM就是一个attempt。同样也不能说39题中的equipment就是一个method.
这里的as和is, act as一样，当表示A is B, A acts as B的时候，A和B都应该是对称的。
呵呵，这句话说得好，
简单易懂啊！ 补充：所谓对称应该就是逻辑上对等。
（不是NN，大家讨论）我觉得考的就是as当介词“作为”讲的时候，前后两个名词应该是对称的（性质，形式等）。
As a child, she was sent to six different schools.这里的she就是一个child.
而我们不能说36中的BM就是一个attempt。同样也不能说39题中的equipment就是一个method.
这里的as和is, act as一样，当表示A is B, A acts as B的时候，A和B都应该是对称的。
as表示作为作为某种身份或角色的时候，AB性质应该是一样的，这点我也赞同，OG中as表示此用法的挺多的：og2, og10,og 27, og 37,og 39,og 104, og 235
但是对于as表示目的或者手段的用法，还是不能很确定。OG中倒是有一题，OG 120，use A as B，这里A和B的性质是一样的。但这是不是能说明所有的都是一样的呢？
120. The Parthenon was a church from 1204 until 1456, when Athens was taken by General Mohammed the Conqueror, the Turkish sultan, who established a mosque in the building and used the Acropolis as a fortress.
(A) who established a mosque in the building and used the Acropolis as
(B)who, establishing a mosque in the building, used the Acropolis like
(C) who, when he had established a mosque in the building, used the Acropolis like
(D) who had established a mosque in the building, using the Acropolis to be
(E) establishing a mosque in the building and using the Acropolis as
我觉得不好分表目的还是作为角色，简而言知作介词时： 逻辑上可以对等即可，也就是看合不合理。找了一点例句，下面的凑合着看吧
金山词霸例句：The kitten uses that box as a bed.
OG RC 9. Which of the following is mentioned in the passage as a disadvantage of storing artifacts in museum basements?
OG RC Passage 4 Some see it as the opposite of rationality: others view it as an excuse for capriciousness.
Fourth, some managers use intuition as a check on the results of more rational analysis.
OG RC 38 It can be inferred from the passage that in the early 1800’s children were generally regarded by their families as individuals who...
更清楚了，谢谢
字典上好像没有 as an attempt的用法 只有in an attempt
所以as an attempt 根本就是错的 对不对
大家讨论
偶认为很简单的啊，主语toad不能 as an attempt 只能in an attempt。
36. Bufo marinus toads, fierce predators that will eat frogs, lizards, and even small birds, are native to
(A) are native to
(B) are native in
(C) are natives of
(D) had been native to
(E) had been natives of
Choice A is best. The phrasing are native to correctly suggests that the toad species is indigenous to, and still exists in,
as 在这里就是“作为。。，当作。。”的意思。在B和E中：
(B) are native in
(E) had been natives of
根据b,e的意思，toads本身被当作一种尝试来控制害虫。而句子本来的意思应该是把toads引进过来这个行为的目的是为了控制害虫。其实b,e中，as的用法就像前面的ggmm们讨论的一样，是use toads as attempts把toads当作。。来用。完全不是原句要表达的意思！另外，as an attempt这种用法是不是安全错了，也不一定！虽然它不是一个固定用法，自然在字典上找不到~可是如果前面的主语和attempt是同类可以比较的话，个人觉得as an attempt也是可以接受的！还请大家讨论~
as an attempt 是否可以理解为做为一种尝试，而OG上说，做为尝试的应该是introduce本身，那么introduced into...as an attempt 为什么又不对呢？？
不好意思，很弱的问题。
呵呵，这句话说得好， 简单易懂啊！ 补充：所谓对称应该就是逻辑上对等。
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