【正确答案】 A

【答案解析】[解析] motive：动机。reason：理由。There is no reason to doubt his word. 没有理由不相信他的话。argument：论据。There are many arguments against smoking. 有许多论据可以证明吸烟是有害的。target：目标。The target of the new plan is primary education for all children. 新计划要取得的目标是使所有的孩子都能受到初等教育。stimulus：刺激。stimuli是其复数形式。Reduced tariffs are a stimulus to foreign trade. 降低关税可以促进外贸。