According to the passage, heroes are compared to high-voltage transformers in that ______.A. they have a vision from the mountaintopB. they have warm feelings and emotionsC. they can serve as concrete examples of noble principlesD. they can make people feel stronger and more confident

本题考查对文章中比喻手法的理解，核心在于抓住比喻的相似性。文章将英雄比作“high-voltage transformers”（高压变压器），需明确两者功能上的共性：变压器将高电压转化为可用的低电压供大众使用，而英雄的作用是将崇高的原则转化为具体行动，供人们效仿。正确选项需体现这一转化关系。

选项分析

• A．they have a vision from the mountaintop
  仅描述英雄的远见，未涉及比喻的核心功能（转化原则）。

• B．they have warm feelings and emotions
  与变压器的机械特性矛盾，情感非比喻重点。

• C．they can serve as concrete examples of noble principles
  直接对应比喻：英雄将抽象的“崇高的原则”（如理想、信念）转化为具体的行动或榜样，供大众学习，如同变压器将高电压转化为可用电力。

• D．they can make people feel stronger and more confident
  虽英雄可能激励他人，但此选项未体现“转化原则”的核心功能。