高级英语 张汉熙 修订本第一册课后练习答案

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Unit 3 Ships in the Desert
1)The writer went to the Aral Sea to search for the underlying causes of the environmental crisis. What he saw there was hot dry sand.
　 2)It was the annual layers of ice in a core sample dug from the glacier.
　 3)Scientists were monitoring the air several times a day to chart the course of the climate change.
　 4)Because the polar cap plays a crucial role in the world's weather system, the thinning of the polar cap might cause flood in many places of the world.
　 5)There are more different species of birds in each square mile of the Amazon than exist in all of North America. The destruction of the Amazon rain forest will mean silencing thousands of songs we have never even heard.
　 6)The writer calls noctilucent clouds"ghosts in the sky". As a result of pollution, the clouds occasionally appear when the earth is first cloaked in the evening darkness. And they appear more often because of a huge buildup of methane gas in the atmosphere.
　 7)Because we are not yet awakened to take effective measures to deal with the climate change.
　 8)Carbon dioxide's ability to trap heat in the atmosphere causes global warming. Because global warming seriously threatens the global climate equilibrium that determines the pat- tern of winds, rainfall, surface temperatures, ocean cur- rents, and sea level. These in turn determine the distribution of vegetative and animal life on land and sea and have a great effect on the location and pattern of human societies.
　 9)The two key factors are human population and the scientific and technological development. The dramatic changes that have occurred in these two factors are a sudden and startling surge in human population and a sudden acceleration of the scientific and technological revolution.
　 10)The writer's solution to our ecological problems is to reinvent and finally heal the relationship between human beings and the earth by carrying out a careful reassessment of all the {actors that led to the relatively recent dramatic change in the relationship.
Ⅱ.
　 1)It was not at all possible to catch a large amount of fish.
　 2)Following the layers of ice in the core sample, his finger came to the place where the layer of ice was formed 2050 years ago.
　 3)keeps its engines running for fear that if he stops them, the metal parts would be frozen solid and the engines would not be able to start again
　 4)Bit by bit trees in the rain forest are felled and the land is cleared and turned into pasture where cattle can be raised quickly and slaughtered and the beef can be used in ham- burgers.
　 5)Since miles of forest are being destroyed and the habitat for these rare birds no longer exists, thousands of birds which we have not even had a chance to see will become extinct.
　 6)Thinking about how a series of events might happen as a consequence of the thinning of the polar cap is not just a kind of practice in conjecture (speculation), it has got pr