单项选择题
A．point B．place C．position D．part
A. affect their nutritional content B. poison you C. improve soil quality D. be eaten E. show that organic crops are safer than conventional ones F. be specially trained
A．reduces the risk of laryngeal cancer. B．explains why inflammation triggers cancer. C．accounts for why food can coat digestive-tract tissues. D．is the reason why food can scrub alcohol off tissues.