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第1段

1 .<-NARRATOR:-> Now Listen to part of a lecture in an environmental studies class.

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第2段

1 .<-FEMALE PROFESSOR:-> What happens, biologically speaking,

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2 .when a major climate change occurs?

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3 .Well, scientists generally agree that the extinction of various animal or plant species

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4 .is one very likely effect.

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5 .This has happened in the past.

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6 .An example is the disappearance 35,000 years ago

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7 .of a giant Australian bird called the thunder bird.

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8 .Now these birds were so big that they couldn't fly.

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9 .[finding the thread again] But as I was saying, uh...right...many scientists are convinced

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10 .that it was a change in climate that caused this species to become extinct.

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第3段

1 .Here's the evidence,

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2 .here's why scientists think it was climate change:

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3 .[pause] researchers have discovered an enormous number of 35,000 year-old thunder bird bones,

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4 .all together in one spot¡ª

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5 .the bones were found near an ancient, dried up lake.

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6 .Now it's really rare to find so many bones from the same species in one place,

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7 .but there it is: you have all

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8 .these 35,000-year-old thunder bird bones, all together near this dried up lake.

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9 .So what's the explanation?

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第4段

1 .Well, many scientists believe

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2 .that a change in the Australian climate

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3 .may be behind this ...

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4 .Their hypothesis is...

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5 .they think that during a very long dry period,

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6 .when there was no rainfall,

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7 .the birds may have flocked together at this lake.

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第5段

1 .You see, during a drought, animals tend to gravitate

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2 .toward the last few remaining water sources.

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3 .But then, if it still doesn't rain, if the drought lasts too long,

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4 .the water source

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5 .may dry up, too,

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6 .and if that happens, the animals that have gathered there, well, they die.

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第6段

1 .Scientists think this

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2 .ancient lake where they found the bones was one of the last remaining sources of fresh water

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3 .during the drought, so

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4 .that's where all these birds gathered.

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5 .They survived there for a time,

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6 .but eventually the lake dried up,

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7 .and well, that was it.

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8 .By the time the drought ended, the species was extinct.

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