The beavers at the Minnesota Zoo seem engaged in an unending task. Each week they fell scores of inch-thick young
trees for their winter food supply. Each week zoo workers surreptitiously replace the downed trees, anchoring new ones in
the iron holders so the animals can keep on cutting. Letting the beavers do what comes naturally has paid off: Minnesota
is one of the few zoos to get them to reproduce in captivity. The chimps at the St. Louis Zoo also work for a living: they
poke stiff pieces of hay into an anthill to scoop out the baby food and honey that curators hide inside. Instead of idly
awaiting banana handouts, the chimps get to manipulate 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 mated and formed families—a rarity among captives. “Zoos
have changed from being mere menageries 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 intensifying the naturalness of the experience for both
visitors and animals.”
【題組】48 According to the passage, how has the Minnesota Zoo benefited from their new project for the beavers?
(A) The Zoo has to hire more people to work for the beavers.
(B) The Zoo has more beaver families and baby beavers.
(C) The Zoo has to spend more money building houses for the beavers.
(D) The Zoo attracts more visitors to see the beavers.
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