Dinner is 16!
答案：(D) served
Dinner is served!（晚餐上桌了！）為固定用語，此處幽默地表示黑猩猩挖出小昆蟲、準備享用大餐；proposed／ordered／digested 均不符合此處語境。
serve 這個字，你的印象大概只有「服務」，或是餐廳裡服務生端盤子那個畫面，不太會想到它就是「上菜、供餐」這個動作本身。
答對率不到五成，鑑別度高達 59，是本批最會分人的一題，分的是認不認得 Dinner is served. 這個餐桌上的固定說法。主動是 serve dinner（上菜、供餐），主詞是端菜出來的人；把 dinner 提到句首當主詞就成了被動 Dinner is served，中文就是「開飯了」。這一句是作者替黑猩猩下的旁白——牠用一根細長的草莖把小蟲挖出來，一頓晚餐就上桌了。
ordered（點餐、訂購）與 digested（消化）都能跟 dinner 擺在一起，形態也吻合，容易被順手選走；但黑猩猩不會點餐，而 Dinner is digested 講的是飯已經吃完消化掉了，與這一刻剛把蟲子挖出來的畫面對不上。propose 是「提議、求婚」，接不上 dinner。
Dinner is served.（開飯了、飯菜上桌了）、serve（上菜、供餐；也作服務）、dig out（挖出）、pick up（撿起、拿起）、be good at（擅長）、digest（消化）。
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.