1.
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. (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（C） (E) Originating, it is believed, from a small area on their foreheads, low-frequency sounds are emitted by elephants that may be used Q:我认为因为C中believed to 前有,分开,导致C中的believed to 的逻辑主语应为Elephants ,而不是 sounds,不符合逻辑,故我认为E对,E中IT指代整句的主语sounds ,弥补了C中的逻辑错误. | 
