Lonsdorf has always been interested in animal learning and tool use, 18 the way young animals grow up and learn their way in the world.
答案：(A) especially
【轉折語／副詞】especially 用以強調隆斯多夫特別感興趣的重點——幼小動物如何成長與學習，語意上是對前述「動物學習與工具使用」的進一步聚焦。originally（最初）、consequently（因此）、fortunately（幸運地）均不符文意。
四個選項都是 -ly 結尾的副詞，都能放在逗號後面，形態上刷不掉，你只好一個一個代進去讀讀看。
鑑別度高達 55，分的是有沒有看出逗號前後兩樣東西的大小關係。逗號前是 animal learning and tool use（動物的學習與工具使用），是一個大範圍；逗號後是 the way young animals grow up and learn their way in the world（幼獸如何長大、如何摸索出自己在世界上的路），這是前面那個大範圍裡的一小塊，而且是她最感興趣的那一塊。從一個大範圍縮到裡面最突出的一項，用 especially（尤其是、特別是）。填進去讀成 interested in animal learning and tool use, especially the way young animals grow up。順帶留意逗號後 the way 直接接了一個完整的子句，中間什麼都不必加。
originally（原本、起初）要求後面講的是最早的情況，並與後來的改變成對照，這裡沒有這個時間對比；consequently（因此、結果）要求前面是原因、後面是結果，但後半並不是前半造成的；fortunately（幸好）是說話者對一件事的評價，逗號後只是把興趣的範圍講得更精確，沒有好運可言。三個都是 -ly 副詞，形態吻合，容易被順手選走。
especially（尤其是、特別是）、be interested in（對……感興趣）、tool use（工具的使用）、consequently（因此、結果）、originally（原本、起初）、the way ＋ 完整子句（……的方式；the way 後面可接 that、可接 in which，也可以什麼都不接）。
Hiding herself among the trees near a chimpanzee habitat, Elizabeth Lonsdorf is using her camera to explore mysteries of learning. The chimpanzee she records picks up a thin flat piece of grass and then digs out tiny insects from a hole. Dinner is 16 ! But how did the chimp develop this ingenious skill with tools? Do the chimp babies copy their parents in using tools? Do the mothers most skilled with tools have offspring who are also good at using tools? Here in Africa, Lonsdorf is conducting one of the world's longest wildlife studies, trying to discover how learning is transferred 17 generations.
Lonsdorf has always been interested in animal learning and tool use, 18 the way young animals grow up and learn their way in the world. Her chimpanzee study shows a clear link between humans and the rest of the animal kingdom. The chimps make and use tools and have mother-child relationships very 19 to those of humans. Through observing chimpanzees' learning process, researchers hope to gain insight into what the development of our earliest ancestors 20 like.
Lonsdorf hopes that by understanding the complexity of animal behavior, we can better appreciate and protect the diversity of life on this planet.