[解析]
(1)D.细节理解题。由第一段中的"and I found him very interesting.I sat there absorbed and listened while he spoke of unusual plants and his experiments (he even told me astonishing facts about the simple potato)"我发现他很有趣,在他谈及罕见植物和他的试验时,我坐在那儿专注而认真地听(他甚至告诉我关于土豆的惊人事实)。由此可见,作者对于植物学家所说的感到很惊奇。故选D.
(2)A.推理判断题。由第二段中的"but I broke an important rule of politeness.I ignored everyone else and talked for hours to the botanist"但我违反了一条重要的礼貌规则,我忽视其他人,与植物学家聊了几个小时。由此可知,作者认为,忽略其他人只和植物学家谈话是不礼貌的。因此判断出,关注参加的所有人是有礼貌的行为。故选A.
(3)B.推理判断题。根据最后一段"And so I had him thinking of me as a good conversationalist when,in reality,I had only been a good listener and had encouraged him to talk."当我在现实中,成为好的倾听者,并鼓励他继续说时,我使他认为我是一个健谈者。由此可知,健谈的人会认真听,并鼓励说话者继续。因此判断出,B选项"认真听,鼓励对方继续"是健谈的人的特征。故选B.