D against一词多义。 ①反对;逆 (本文含义) 。如:It is against the law.这是违法的。 ②接触;碰撞。如:He was leaning against the tree.他正斜靠在树上。 ③衬托;相映。如:The building looks more beautiful against the snow.这栋大楼在白雪的衬托下更加美丽。 ④防备;预防。如:We should take some steps against fire.我们应该采取防火措施。 由本题句意“大多数人反对这个计划吗?”可知D正确。