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The following question consists of four sentences on a topic. Some sentences are grammatically incorrect or inappropriate. Select the option that indicates the grammatically correct and appropriate sentences.

1. Large reductions in the ozone layer, which sits about $15-30$ km above the earth, take place-each winter over Polar regions, especially the Antarctic, as low temperatures allow the formation of stratospheric clouds that assist chemical reactions breaking down ozone.
2. Industrial chemical containing chlorine and bromine have blamed for thinning the layer.
3. because they attack the ozone molecules, making them to break apart.
4. Many of offending chemicals have been banned.
5. It will still take several decades before these substances have disappeared from the atmosphere.
1. D only
2. B & D
3. A & D
4. A & C

1
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