Earth&Sky:黃石地區(qū)野牛群不得病

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A century ago, there were only about 25 bison left in Yellowstone National Park due to overhunting. But today's free-ranging bison herd is so large, the park has been required to reduce the herds size. That's because of the risk of the bison spreading disease to nearby cattle.

Marm Kilpatrick: Because of the risk of [---1---] of this disease, brucellosis, a third of the population was rounded up and taken to slaughter.

You're listening to ecologist Marm Kilpatrick. He's speaking of the winter of 2007-2008, when [---2---], and the large size of the herd, caused more than a thousand bison to leave the park to find food. Nearby ranchers worry that their cattle will [---3---] the disease the bison carry.

Marm Kilpatrick: If the bison population gets up to five or seven thousand individuals, then every year you're going to have a substantial number of bison outside the park. And, if the management strategy is to basically not allow more than a couple hundred bison outside the park, then it's going to result in these years when you're going to have [---☆---] events.

[---5---].

Marm Kilpatrick: We have to either be comfortable with bison roaming the plains again, or be comfortable with some management strategy that includes controlling the bison population in a very active, managed way.

I'm Lindsay Patterson for E&S, a clear voice for science.
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PS：由于本期第☆空有點(diǎn)復(fù)雜，而且沒有確切的答案，所以不用寫在聽寫答案里，只聽其他四空，關(guān)于☆這空的內(nèi)容，有想法的同學(xué)可以在下面討論區(qū)留言，歡迎大家積極討論~