2. 外语
  3. Hundreds of species of fish generate and discharge electric currents, in bursts or as steady electric fields around their bodies

Hundreds of species of fish generate and discharge electric currents, in bursts or as steady electric fields around their bodies

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问题 Hundreds of species of fish generate and discharge electric currents, in bursts or as steady electric fields around their bodies, using their power either to find and attack prey, to defend themselves, or also for communicating and navigating.
选项 A、either to find and attack prey, to defend themselves, or also for communicating and navigating
B、either for finding and attacking prey, defend themselves, or for communication and navigation
C、to find and attack prey, for defense, or communication and navigation
D、for finding and attacking prey, to defend themselves, or also for communication and navigation
E、to find and attack prey, to defend themselves, or to communicate and navigate
答案E
解析 Idiom; Verb form
The sentence explains that fish discharge electric currents for several purposes, which are most efficiently and effectively described in a parallel structure: to find and attack, to defend, or to communicate and navigate. The use of either is inappropriate in this sentence because more than two uses of electric currents are listed; idiomatic usage requires either to be followed by or to identify alternatives, not by also.
A Either inappropriately introduces a list of more than two alternatives, and it should not be followed by or also; parallelism requires that for communicating and navigating be changed to to communicate and navigate.
B Defend is not parallel with the list of gerunds, leaving the reader to wonder how to make sense of defend themselves.
C The lack of parallelism obscures the relationships among the items in the series; it is especially confusing to list an infinitive phrase (to find...), an object of a preposition (for defense), and nouns with no grammatical connection to the verb phrase (communication and navigation).
D This answer choice also violates parallelism by mixing an infinitive with objects of the preposition for. Or also is an unidiomatic, contradictory expression.
E Correct. The different ways in which the various species offish use their electric power are correctly expressed in a series of parallel infinitives.
The correct answer is E.
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