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The moon: modais de dedução (B1)

The Moon looks peaceful in the night sky, but it is a hostile world. There is no air around it, so sound ___ travel from one place to another: an astronaut can shout as loudly as he wants and nobody will hear him. Temperatures change from about 120 degrees during the long lunar day to nearly minus 170 at night. Because there is no wind or rain, the footprints left by the first astronauts in 1969 are still perfectly visible. Several space agencies are now preparing new missions to build a small permanent base.

Fonte: English for ALL (texto original).

Assinale a alternativa que completa corretamente a lacuna do texto.

  1. A) must
  2. B) should
  3. C) may
  4. D) might
  5. E) cannot
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Resposta correta: E

Quando concluímos que algo é logicamente impossível, usamos "cannot/can't" como modal de dedução negativa; o texto afirma que não há ar, e o som não se propaga no vácuo. "Must" expressa certeza positiva e inverteria completamente o sentido da frase. "May" e "might" indicam mera possibilidade, o que contradiz a explicação seguinte de que ninguém ouvirá o astronauta.

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