Question

Remove a verb in the Present Simple from the text above.


THE WATER WE DRINK

The water we drink usually comes from reservoirs, lakes or rivers. A large number of cities uses river water and dump it back into the river. This water may be badly polluted with chemicals and pathogenic bacteria. Many different chemical treatments are necessary to make it safe and palatable again.
We can demand an end to water pollution by industries and cities. And we must know how to use the water of the earth because that is all the water we have.

Answer 1

Resposta:

Sometimes another city downstream uses thesame water. This water may be badly polluted with chemicals and pathogenic bacteria. Many different chemical treatments arenecessary to make it safe and palatable.Chemical engineers usually place the water into a settling basin to purify it. Then, they treat it with slaked lime andaluminum sulfate. The chemical reaction of these elements formsa gelatinous mass. This mass carries down dirt particles and bacteria.Many communities add some form of fluoride to theirwater. Fluoride in concentrations of 0.7 to 1.0 ppm (parts permillion) can significantly reduce tooth decay in children.Some communities, usually the smaller ones, obtain waterfrom wells. Even they have problems because sometimes theground water is contaminated. In some parts of the country thecontamination of nitrates in well water is above the maximum safelevel of 1.0 ppm. These nitrates come from agricultural fertilizersand from the decomposition of organic wastes.What can we do? We can fight for clear water andconvince our neighbors to do the same. We can demand an end towater pollution by industries and cities. And finally, we mustknow how to use the water of the earth because that is all we have.

VOCABULARYdumps

: despeja

dowstream

: rio abaixo , corrente abaixo

badly

: mal; muito (sentido negativo, de coisa ruim)

fluorine

: flúor

nitrate

; nitrato

smaller

: menores

wells

; poços

demand

: exigência

tooth decay

; carie nos de

Explicação:

eu ñ sei se era assim para fazer , qualquer coisa vc me fala