question: Jeff should add _____ to his engine to decrease the friction in its processes.
choices.text: oil gas
choices.label: A B
para: To reduce friction, oil is added to the engine.
para_anno.effect_prop: friction in the engine
para_anno.cause_dir_str: added
para_anno.effect_dir_str: reduce
para_anno.cause_dir_sign: MORE
para_anno.effect_dir_sign: LESS
para_anno.cause_prop: oil in the engine
question_anno.less_effect_dir: decrease
question_anno.less_effect_prop: engine friction
question_anno.less_cause_dir: engine friction