question: Chris is studying two countries. He finds that China has twice as many factories putting out fossil fuels into the air than the United States. Based on this information, the factories in _____ are causing more air pollution.
choices.text: United States China
choices.label: A B
para: Because richer nations use more fossil fuels, they also cause more air pollution and global warming than poorer nations do.
para_anno.effect_prop: air pollution
para_anno.cause_dir_str: more
para_anno.effect_dir_str: more
para_anno.cause_dir_sign: MORE
para_anno.effect_dir_sign: MORE
para_anno.cause_prop: fossil fuels
question_anno.more_effect_dir: more
question_anno.more_effect_prop: air pollution