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According to the professor, what characteristic of Earth's moon should a theory of its origin be able to explain？
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听力原文： The vast arctic ice cap is shrinking so fast it could melt away completely before the end of this century. These are the dire warnings from NASA scientists who say they are stunned by the findings. They claim more ice on the North Pole is disappearing every year because of the climate changes. BBC's science correspondent Christine McGourty reports:
A vast frozen wilderness, but the climate here is changing, and for the wildlife that could be devastating. Floating ice provides polar bears with a platform. for hunting seals but new satellite data show sea ice melting at a rate of 8% every decade. This map shows how sea ice changes with the seasons, spreading in the cold arctic winter and then decreasing in the summer months to a September low. But this year, there's 500,000 square miles less than in the 1970s.
What has the NASA report revealed？
听力原文： 25,000 body bags have been delivered to rescue workers in New Orleans amid reports that they are about to start an operation to collect the bodies of the victims of Hurricane Katrina. Only 83 corpses have been recovered so far but there are fears that the number of those killed could be in the thousands and the authorities have been warning residents against the dangers of the polluted waters. The Director of the Centers for Disease Control in the US, Dr. Julie Gerberding, has been warning residents against staying in the city.
"We believe that the health hazard from this water is still a very important threat to the people who have yet to evacuate. Basically the results indicate that the water is full of sewage. We know this is not safe. We know that there are many common intestinal illnesses that can be transmitted by ingesting the sewage and in some cases by being in the water with these organisms in it without protective clothing. So for the evacuees who haven't left the city yet, you must do so."
How many dead bodies have been recovered according to the report？
预应力混凝土在强张拉完成以后，测得的延伸量与预计延伸量之差应在6%以内。 ()
有效氧化钙与氧化镁含量是判定石灰质量的主要指标。 ()
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