Asweallknow,eversincetheywerefirstputonthemarketintheea...
问题详情：Asweallknow,eversincetheywerefirstputonthemarketintheearly1990s,geneticallymodified(GM,转基因)foodshavebeenincreasinglydevelopedandmarketedinmanycountriesintheworld,mainlyonthebasisoftheirprom...