Devoir Cned anglais 2 (niveau seconde)

1) b. 2) c. 3) a. 4) c. 5) b. 6) c. 7) according to the text, rainwater ''is a safe, dependable source of drinking water'' '' rainwater countains no mineral or salt '' ''is free of chemical treatments.'' and ''is free'' (L.5-6-7) 8) according to the text, ground water contrains minerals, salt and chemical treatments it is even polluted by natural high levels of arsenic poison (L2-6-7)

9) The water falls on top of the buildings. Then, thanks to a system of pipes it is collected and finally ends up in the tank. 10) a. WRONG, as mentioned in the first two lines of the text, ground water is naturally polluted by the high level of arsenic poison (L.1-2) (“The total cost to build this rainwater harvesting system is about forty dollars”)

b.RIGHT. It costs about forty dollars according to the last lines of the text (L 21) (“Each year, millions of people in Bangladesh drink ground water that has been polluted by naturally high levels of arsenic poison)

c. RIGHT They can be considered small as it is only two meter tall, however it is a ble to provide a familly of five enough water to survive a five month dry season. (L 9/22) (“ The pipes stretch from the buildings to a two-meter tall storage tank “ / The group says one tank can provide a family of five with enough rainwater to survive a five-month dry season. '')

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d.RIGHT. The tank needs to be protected to prevent dirt and leaves from falling inside it. It is also covered to avoid mosquito from laying eggs in the water. If we could aso protect it from sunlight, the bags inside the tank would last longer.In addidtion, ''the system should be built on a raised structure to prevent insects from eating into it at the bottom'' (L 10-11-13-18) (. ''This barrier prevents dirt and leaves in the water from falling inside the tank'' / It protects the water inside the tank from evaporating. The cover also prevents mosquito insects from laying eggs in the water.''/'' if the bags are not damaged by sunlight, they could last even longer. '')

e.Wrong ''A fitted cover sits over the “first-flush” device.'' the first flush device is not the filter, the filter is on it. (L 12)(''A fitted cover sits over the “first-flush” device'')

f. RIGHT. The system can provide enough water for a a familly of five people for five month. (L22) (“ The group says one tank can provide a family of five with enough rainwater to survive a five-month dry season”)

11) 1 The pipes 2 The storage tank 3The first-flush 4 A fitted cover 5 A low cost plastic bag 6A plastic bag similar to those used to hold grains

12) The amintenance of the system will be cheap because according to the International Development Entreprises, the inner bag may need to be replaced every two to three years. However if we protect the bags from the sun dammaging them, they could last even longer ! And the bags are the only things that will need to be replaced over time, and as mentioned in the text, they are made of plastic so they will probably be cheap. We can confirm that by looking at the price of the whole system which is about forty dollars, the bags

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