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My answer was wrong. But, I still think my choice was right. Help me please.

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**Where would it best fit in the passage? Choose (1),(2), ... ,or(5)

It caused a buildup of ice which impeded ships needed to supply food and fuel to the three research stations.

(1) The giant iceberg had blocked sea access to the region, threatening penguin breeding colonies for some months. (2) The iceberg contains enough water to supply the Nile River for 80 years, which had blocked wind and water currents in the sound. (3) The U.S. McMurdo Station and New Zealand's Scott Base are on the sound. (4) Two ice breakers managed to smash a 50-kilometer (30-mile) track through the ice to McMurdo Pier, enabling ships to deliver supplies. (5)

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My choice was (3). But the answer was (2). Is it right?
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The giant iceberg had blocked sea access to the region, threatening penguin breeding colonies for some months. The iceberg contains enough water to supply the Nile River for 80 years, which had blocked wind and water currents in the sound. The U.S. McMurdo Station and New Zealand's Scott Base are on the sound. Two ice breakers managed to smash a 50-kilometer (30-mile) track through the ice to McMurdo Pier, enabling ships to deliver supplies.

To be honest with you, Jisu, the whole text is very poorly composed, and could hardly serve as a coherent paragraph, no matter where you insert the sentence. Notice for instance, this section: 'enough water to supply the Nile River for 80 years, which had blocked wind and water currents'.

I would suggest you not worry about it. There is no particularly reasonable place to insert the sentence.
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It is badly written as it sounds as though the Nile River has been blocking wind and water currents. I think they wanted to say that the iceberg has been doing the blocking.
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Comments  
I would ask where this text came out of? There doesn't seem to be a reasonable solution to the question, though my best guess would have been #4. Since "the buildup of ice impeded ships needed to supply...", it would only be reasonable to have a solution to the problem.

By the way, #5 was never listed.
Thank you.

Then, What is wrong with the sentence 'The iceberg contains enough water to supply the Nile River for 80 years, which had blocked wind and water currents in the sound.'?

The paragraph must be written by a Korean, I think. I'd rather write or email to the publisher. Thank you..
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 nona the brit's reply was promoted to an answer.