either是看有没有NOT还是句意的否定?they are unable to find food ,or find each other,___.(too/either)

either是看有没有NOT还是句意的否定?
they are unable to find food ,or find each other,___.(too/either)

当然是看句意哦,not不也是表达否定的一词吗
所以这里应该填either

句意的否定，那个题应该选either

either