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模考42 Task 6
Sample Answer
Well, the professor gives us a lecture on the probable consequence of a significant climate change. And she demonstrates an example of the extinction of thunderbird, a huge-sized Australian bird, 35,000 years ago. As a large amount of bones of thunderbirds were discovered close to a site which used to be a lake in history, scientists wondered what gave rise to this phenomenon. And then a drought is regarded as the reason behind it. Researchers presumed that when the drought occurred, thunderbirds gathered around the lake where water was still available. However, since there had been no rain for a long time, the water in the lake was gradually exhausted. So at first the birds managed to maintain living on the lake water, but finally they died off. And when it rained again and the drought was over, the thunderbird species died out. All in all, the draught is a possible cause for the extinction of thunderbirds.