1. Believed to originate from asmall area on their foreheads, elephants emit low-frequency sounds that may beused as a secret language to communicate with othermembers of the herd. (A) Believed tooriginate from a small area on their foreheads, elephants emit low-frequencysounds that may be used (B) Elephants emitlow-frequency sounds that are believed to originate from a small area on their foreheads,and they may use this (C) Elephants emitlow-frequency sounds, believed to originate from a small area on theirforeheads, that they may use (D) Originating,it is believed, from a small area on their foreheads; elephants emitlow-frequency sounds they may use（C） (E) Originating,it is believed, from a small area on their foreheads, low-frequency sounds areemitted by elephants that may be used
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发表于 2010-9-27 20:40:37
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