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Apuntes

```plaintext PARTE 4A RESPONDA LAS PREGUNTAS 21 A 25 DE ACUERDO CON EL SIGUIENTE TEXTO Lea el texto y seleccione la palabra adecuada (A, B o C) para cada espacio. En las preguntas 21 - 25, marque A, B o C en su hoja de respuestas. Masks If there is one object that (0) ____ the coronavirus pandemic... it is the mask. A small square of plastic or fabric that has (21) ____ essential to protect ourselves from the spread of Covid-19. This accessory, (22) ____ acts as a barrier to microbes and other harmful substances, is not new. Thanks to the observation of the first “scientists” and doctors of the past, the mask was created, it must be said, to protect us. This type of mask is worn (23) ____ health professionals during surgery (24) ____ protect the patient, covered with a sterile drape. In this way, the patient is protected from possible infection. Although it is not designed for this, it is also often worn to protect oneself both against air pollution (25) ____ possible infections, as during the pandemic of Covid-19. This widespread use is currently causing a global shortage of these masks: it becomes a central problem of the coronavirus pandemic. Recuperado y adaptado de: https...