GMAT Practice Question Set #6 (Question 16-18)

Sentence Correction Question #18: Atmospheric Pollutants  
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Floating in the upper layer of the atmosphere, a group of scientifically made particles collects and transmits data on the interactions between cosmic rays and man-made pollutants, interactions that affect the climate throughout the world.


pollutants, interactions that affect


pollutants, with interactions affecting


pollutants that affects


pollutants that is affecting


pollutants as affects

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