单项选择题

Over the years there have been countless fans of the classic Hanna-Barbera
Line cartoon character Yogi Bear. The cartoon series enjoyed by young and old
alike revolved mostly around the misadventures of this loveable bear and his
sidekick Boo-Boo as they attempted to snag "pic-a-nic" baskets in the made-up
(5) land of Jellystone Park. It’s not often that people think about where the ideas for
these cartoon characters came from, which brings up an interesting point: Do
bears actually search for food left in picnic baskets and unattended campsites
Anyone who has watched an episode of the classic cartoon can see that the bears’
behavior goes far beyond the limits of what is natural. The thing that must be
(10) explored, then, is which of those humorous antics were imagined by the writers
at Hanna-Barbera, and which were actually based on a bear’s normal behaviors.
Remarkably enough, bears have been known to seek out food from some
unlikely sources, including picnic baskets, to supplement their usual diet of berries,
insects, and fish. Bears work throughout the summer and fall to build up fat stores
(15) to have energy enough to last them through their winter hibernations. Related to
this is their need to replenish their depleted reserves when they wake up in the
spring. Food is generally scarce in the early spring and consequently the bears will
gladly indulge in any foods that are high in proteins or fats. This is the main reason
for any incidents involving bears after they enter campsites in search of food.
(20) Although this behavior may seem strange, it is merely the result of nature
equipping the bears with a variety of traits that allow them to remain well fed in
increasingly human-populated habitats. Specifically, the American black bear,
Ursus americanus, has color vision, which most other animals lack. Black bears
have been observed by scientists using this unique enhancement to distinguish
(25) between varying food items at close range. On top of this, bears have an acute
sense of smell and can use their especially sensitive lips to locate food. These
sensory talents contribute to the bears’ remarkably high intelligence and curiosity,
giving them the ability to open closed containers if they believe food is inside.
Their exploratory and navigational skills are also worthy of note—most bears will
(30) maintain vast territories to be sure they can obtain food from a variety of sources.
Bears may even vary their sleep cycles in areas where there is a large degree of
human activity, either feasting on road-side garbage during the day or scouring
campsites for leftovers at night. According to the passage, all of the following are advantages of humans over robots EXCEPT: