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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 South America but were introduced into Florida during the 1930's in an attempt to control pests in the state's vast sugarcane fields.
(A) are native to South America but were introduced into Florida during the 1930's in an attempt to control
(B) are native in South America but were introduced into Florida during the 1930's as attempts to control
(C) are natives of South America but were introduced into Florida during the 1930's in an attempt at controlling
(D) had been native to South America but were introduced to Florida during the 1930's as an attempt at controlling
(E) had been natives of South America but were introduced to Florida during the 1930's as attempts at controlling
Choice A is best. The phrasing are native to correctly suggests that the toad species is indigenous to, and still exists in, South America. In B, native in is unidiomatic; in C and E, natives of illogically suggests that each toad now in Florida hails from South America. In D and E, had been inaccurately implies that the toads are no longer native, or indigenous, to South America, and introduced to Florida is unidiomatic. 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. The correct phrase, in an attempt, should be completed by an infinitive (here, to control), as in A. Choice A is best. The phrasing are native to correctly suggests that the toad species is indigenous to, and still exists in, South America. In B, native in is unidiomatic; in C and E, natives of illogically suggests that each toad now in Florida hails from South America. In D and E, had been inaccurately implies that the toads are no longer native, or indigenous, to South America, and introduced to Florida is unidiomatic. 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. The correct phrase, in an attempt, should be completed by an infinitive (here, to control), as in A.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 Florida as an attempt to control... 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 Ashanti nation in Africa, animal-hide shields with wooden frames were essential items of military equipment, a method to protect warriors against enemy arrows and spears. (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.
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发表于 2005-1-18 22:51:00
简单易懂啊！ 补充：所谓对称应该就是逻辑上对等。
楼主
