空格里应填 though,therefore还是 since?Not only can ratlesnakes ____ sense the presence of another animal --- or a human --- but they apparently can instantly determine its direction and range.

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空格里应填 though,therefore还是 since?Not only can ratlesnakes ____ sense the presence of another animal --- or a human --- but they apparently can instantly determine its direction and range.

空格里应填 though,therefore还是 since?Not only can ratlesnakes ____ sense the presence of another animal --- or a human --- but they apparently can instantly determine its direction and range.
空格里应填 though,therefore还是 since?
Not only can ratlesnakes ____ sense the presence of another animal --- or a human --- but they apparently can instantly determine its direction and range.

空格里应填 though,therefore还是 since?Not only can ratlesnakes ____ sense the presence of another animal --- or a human --- but they apparently can instantly determine its direction and range.
选 therefore .
though尽管,词语不符;since,结构不对,后面应该是名字或完整短句.
therefore因此.其实可以提到句子前面.
rattlesnakes 响尾蛇
因此,响尾蛇不仅能闻到其他生物或人的气息,而且它们显然可以在瞬间判定方向和范围.