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rascarse la cabeza cuando no hay picor es un ejemplo de actividad substitutiva
during a conflict between two territorial male gulls, one directs his aggressiveness at the grass ("grass pulling ")
pero ahí está nuestra opción substitutiva.la india es la opción substitutiva para la unión europea, para su política en asia.
a true strategic partnership should be established with this great country of a billion inhabitants, compared with 1.2 billion in china.
incluso los estados unidos lo reconocen ahora, aunque aún no han presentado opción práctica alguna substitutiva del protocolo de kyoto.
even the united states now recognises this, although they have yet to come up with an alternative in any practical form to the kyoto protocol.