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Ejercicios resueltos Complete the sentences
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Complete the sentences

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A relative difference

A relative difference

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PALABRAS CLAVE
missing link, skull, burst, hairy, leap

Palaeontologists have been digging in Africa´s sands in search of the missing link between humans and primates. Discovery this year of a fossil skull could be the first evidence of an enormous diversity of ape-like, human-like creatures that existed from five to ten million years ago. Perhaps, humans and chimpanzees might be the only survivors of an ancient burst of evolutionary activity.

Actually, a mere 2% of our genes separate us from from two species of chimpanzees: at some point, as human beings have made our way up the evolutionary scale, becoming taller and less hairy as we travelled, we probably separated from our closest relatives. Nevertheless, the longer scientists study the daily existence of primates, their family life and their complex societies, the more it seems obvious that we are, in fact, the third chimpanzee. This similarity has led chimp expert Dr Jane Goodall to call for human rights to be extended to chimpanzees.

In his book "What It Means To Be 98% Chimpanzee", anthropologist Jonathan Marks argues that the 2% gene difference gave humans the great leap forward of language, separating us significantly from monkeys. That seemingly small amount of genetic matter transported us from trees to urban jungle and transformed us from exhibits into zookeepers, but it does not seem to prevent us from literally killing our "cousins": development and destruction of their natural habitats, along with commercial hunting for food, have cut their numbers from two million chimpanzees at the turn of the last century to less than one-tenth of that now.

Rewrite the sentences with the words given.

a) He won't speak to you unless you ask him a question. If you don't ask him a question, he won't speak to you.

Ayuda: condicional de 1º tipo, probable expresando una advertencia. "If" (si) y "unless" (a menos que) significan lo mismo aunque "unless" se utiliza con verbo afirmativo e "If" con negativo.

b) "You must do it at once", she said. She told me that I had to do it at once.

Ayuda: Reconvertimos la oración a estilo indirecto informando sobre lo que se ha dicho. El verbo introductorio está en pasado y hay cambios en el tiempo verbal: Presente a Pasado, "must" a "had to"

c) The exercise is so difficult we can´t do it. The exercise is too difficult for us to do.

Ayuda: So + adjetivo, introduce una oración subordinada causal y too+ adjetivo + complemento + infinitivo indica igualmente la consecuencia de dicha acción.

d) Some policemen are investigating the crime. The crime is being investigated by some policemen.

Ayuda: se transforma la frase a pasiva porque se da mas importancia al hecho de la investigación que a quien la lleva a cabo.

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