单选题
"The moose (驼鹿) is odd and awkward to look at. Why should
it stand so high at the shoulders? Why have so long a head?" The 19th-century
writer of those words, Henry David Thoreau, was hardly alone in his comment of
the moose. Moose's funny appearance makes us think that it is clumsy and
slow-witted. Is that true? Researchers in North America have uncovered many
facts about this unusual animal. No one denies that the moose
is a giant. Adult moose can grow as high as 1.5 to 2 meters, and weigh as much
as 816kg. Although it has long legs that make it seem foolish, it can run up to
55 km per hour, and those legs can kick off an entire pack of wolves. Moose is
{{U}}vegetarian{{/U}}. It feeds on woody plants, leaves and water plants. It learns
to swim within days of birth, and they have been observed swimming for miles and
diving to a depth of nearly 6 meters to feed on water plants! A
moose can move its eyes and detect motion almost directly behind it without
turning its head. Its nose is also an effective tool. Researchers suggest that
because the moose's nostrils (鼻孔) are far apart, they may give it the unusual
ability to locate the objects on a 3D scale. The moose's hearing adds another
merit to its sensory package. Its ears can turn to all directions, and they can
pick up sounds from other moose as far as 3 km away! Baby moose
tend to be curious and carefree. Their mothers protect them by providing tender
and loyal care. They will attack any who are too close to their young, including
wolves, bears, and even humans. Finally, when the young is about a year old and
its mother is newly pregnant, the mother aggressively drives it away so that it
can begin caring for itself.