La junta de dilatación de un par de rieles de tren, o separación, permite que las vías siempre permanezcan rectasyno sufran deformaciones debido al cambio de temperatura. Si la longitud de cada riel es de 5 metros y la temperatura
cambia de 17°C a 32°C, determina la longitud final de cada riel y la separación mínima que debe existir entre ellos,
considera que los rieles son de cobre.​

using your imagination❤

hey there,

your answer is a) today we hope for clear skies.

let's look at the word(s) progressive verb. progressive means its happening right now. it is not going to happen and it has not already happened. it is happening right now. the sentence "today we hope" in option a is an example of a progressing verb. they are hoping right now. options b, c and d are not progressing verbs. they contain the words have, roared and will be. those words tell us that it has either happened or will happen. a is your answer.

best of luck,

- i.a. -