46 What do the beavers do at the Minnesota Zoo?
(A) They are engaged in a task to find baby food.
(B) They are busy making tools for their winter food.
(C) They keep cutting down young trees for their winter food.
(D) They do nothing but idly awaiting winter food.

The beavers海狸 at the Minnesota Zoo seem engaged in an unending task.

Each week they fell（fall 的過去式） score贏, （體育比賽、考試等中）得（分） of  inch英寸-thick厚 young trees for their winter food supply.

Each week zoo workers surreptitious秘密的，偷偷 replace the downed trees, anchoring錨定; 錨固 new ones in the iron holders so the animals can keep on cutting.

Letting the beavers海狸  do what comes naturally has pay off取得成功，得到好結果：Minnesota is one of the few zoos to get them to  reproduce複製 in captivity關押；囚禁.

The chimps at the St. Louis Zoo also work for a living: they poke推, 戳 stiff硬的，挺的，堅實的, 不易彎曲 pieces of hay（用作飼料或覆蓋物的）乾草 into an anthill蟻垤，蟻塚 scoop out用勺舀出 the baby food and honey that curator 經理人、看守者 hide inside.

Instead of idly無目的地, 無行動 awaiting banana handout資訊, （尤指發給學生或聽報告的人的）講義，印刷品, 禮物, 施捨 the chimps get to manipulation影響, 操縱 tools, just as they do in the wild.

Last year, when 13 gorillas moved into Zoo Atlanta’s new $4.5 million rain forest, they mate配偶、友伴 and form（使）出現，（使）形成  families—a rarity罕見的東西（或人）；稀有 among  captives囚徒；獵獲物.  “Zoos have changed from being mere menageries（私人豢養或供公眾觀賞的一群）野生動物 to being celebrations of life,” says John Gwynne of the Bronx Zoo.

“As the wild places get smaller, the role of zoos gets larger, which means intensify加強，增強；強化 the naturalness of the experience for both visitors and animals.”