2. 外语
  3. Believed to originate from a small area on their foreheads, elephants emit low-frequency sounds that may be used as a "secret la

Believed to originate from a small area on their foreheads, elephants emit low-frequency sounds that may be used as a "secret la

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问题 Believed to originate from a small area on their foreheads, elephants emit low-frequency sounds that may be used as a "secret language" to communicate with other members of the herd.
选项 A、Believed to originate from a small area on their foreheads, elephants emit low-frequency sounds that may be used
B、Elephants emit low-frequency sounds that are believed to originate from a small area on their foreheads, and they may use this
C、Elephants emit low-frequency sounds, believed to originate from a small area on their foreheads, that they may use
D、Originating, it is believed, from a small area on their foreheads; elephants emit low-frequency sounds they may use
E、Originating, it is believed, from a small area on their foreheads, low-frequency sounds are emitted by elephants that may be used
答案C
解析 首句出一个believed过去分词短语，找主句主语elephants。而elephants不能作believedto短语的逻辑主语，因为代入后“大象被认为是起源于它们(指大象)前额上的一小块地方”，让人无法理解；B中的this有问题，在this之前唯一的单数名词是a small area，但原句指用low-frequency sounds作为“秘密语言”，两者不对应且公理中提到过“不用this单独指代”的原则；D中elephants不可能是originating短语的逻辑主语；E中：low-frequency sounds的确是originating的逻辑主语，但句末的定语从句却改变了句意，变为“大象被用来作为语言”。正确答案是C：low-frequency sounds有两个修饰成分，第一个过去分词作插人语限定；第二个是that从句作限定性定语从句。
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