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0308听力课:蜂鸟(录音+文本).doc
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0308听力课:蜂鸟(录音+文本).doc
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《大学生英语在线》
“0308 托福听力:蜂鸟”参考文本
注意:壮壮老师建议同学们最好不看,多听几遍,实在不理解再看文本,这样
才能练好听力 : )
本期节目回放网址:
hp://t.am774.com/Apps/Live/?s=/Program/programReview_gy/pid/194/cid/74876
a lecture in an environmental science class
Professor: Now, we’ve been talking about the loss of animal habitat from housing developments,
uh …, growing cities – small habitat losses. But today I wanna begin talking about what happens
when habitat is reduced across a large area. There are, of course, animal species that require large
areas of habitat, and some migrate over very long distances. So what’s the impact of habitat loss
on those animals – animals that need large areas of habitat?
Well, I’ll use the humming birds as an example. Now you know a humming bird is amazingly
small, but even though it’s really tiny, it migrates over very long distances, travels up and down
the western hemisphere – the Americas, back and forth between where it breeds in the summer
and the warmer climates where it’s spent the winter.
So you would say that this whole area over which it migrates is its habitat because on this long-
distance journey, it needs to come down to feed and sleep every so often, right? Well, the
humming bird beats its wings – get this – about 3 thousand times per minute. So you think, wow,
it must need a lot of energy, a lot of food, right?
Well, it does. It drinks a lot of nectar from flowers and feeds on some insects, but it’s energy-
efficient too. You can’t say it isn’t. I mean, as it flies all the way across the Mexico Gulf, it uses up
none of its body fat. But that doesn’t mean it doesn’t need to eat. So, humming birds have to rely
on plants in their natural habitat.
And it goes without saying, but the opposite is true as well, plants depend on humming birds
too. There are some flowers that can only be pollinated by the humming birds. Without its
stopping
to feed and spread pollen from flower to flower, these plants would cease to exist.
But the problem, well, as natural habitat along these migration routes is developed by humans
for housing or agriculture or cleared for raising cattle, for instance, there is less food available for
migrating humming birds. Their nesting sites are affected too, the same by the same sorts of
human activities. And all of these activities pose a real threat to the humming bird population.
To help them survive, we need to preserve their habitats. And one of the concrete ways people
have been doing this is by cleaning up polluted habitat areas and then replanting flowers, um,
replanting native flowers that humming birds feed on.
Promoting ecological tourism is another way to help save their habitat. As the number of
visitors, eco-tourists who come to humming bird habitats to watch the birds, the more the number
of visitors grows, the more local businesses profit, so ecological tourism can bring financial
rewards, all the more reason to value these beautiful little creatures in their habitat, right?
But to understand more about how to protect them to support the humming birds the best we
can, we’ve got to learn more about their breeding, nesting sites and migration routes, and also
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