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15.Alaskan black bears hibernate for up to seven months a year,during which time they do not eat or drink,before waking up in virtually the same physical state they fell asleep in.
Now experts hope to develop methods of putting humans into a similar state which could help astronauts survive long missions and lead to new ways of treating severely ill patients.
While many studies have examined hibernation in mice and hedgehogs,little research has been done into the same condition in larger mammals such as bears.
But new research conducted at the Institute of Arctic Biology at the University of Alaska monitored the animals'body temperature,heart rate and muscle movements while they slept.
The research results showed that during a five-month hibernation the bears'body temeratures varied between 30℃and 36℃in cycles that lasted between two and seven days-a pattern that was previously unknown in hibernating animals.
The research project leader said,"If our research could help by showing how to reduce metabolic(新陈代谢的) rates and oxygen demands in human tissues,one could possibly save severely ill patients.We simply need to know how to turn things on and off to take advantage of the different levels of hibernation."
Craig Heller,of Stanford University,who contributed to the study,added:"There has always been a thought that,if there is ever long-distance space travel,it would be good to be able to put people into a state of lower metabolism or a state of hibernation.That's almost science fiction but you can see the logical basis."

68.We know from the text thatA.
A.during winter Alaskan black bears sleep for more than half a year
B.researchers have examined hibernation in humans
C.experts have got no results from their research
D.Craig Heller is a leader from the Institute of Arctic Biology
69.The best topic of the text should beD.
A.The Latest Research Results
B.New Methods of Putting Humans into Hibernation
C.Alaskan Black Bears Hibernate
D.Astronauts Could Hibernate Like Bears
70.According to the text,we can infer thatC.
A.many studies have examined hibernation in mice and bears as well
B.humans'body temperatures vary between 30℃and 36℃while they sleep
C.research into hibernation in animals may help deadly patients stay longer
D.scientists have already take advantage of the different levels of hibernation in space missions.

分析 本文属于记叙文阅读,作者通过这篇文章向我们介绍了拉斯加黑熊每年冬眠七个月,而如今专家正在开发使人类进入类似冬眠的方法,这样可以帮助宇航员在长期的任务中生存,并为治疗重症病人提供新的方法.

解答 68.A  细节理解题,根据第一段Alaskan black bears hibernate for up to seven months a year可知阿拉斯加黑熊每年冬眠七个月.故选A.
69.D  主旨大意题,通读全文可知本文主要向我们介绍了如今专家正在开发使人类进入类似冬眠的方法,使宇航员可以像熊一样冬眠,故选D.
70.C  细节理解题,根据倒数第二段If our research could help by showing how to reduce metabolic(新陈代谢的) rates and oxygen demands in human tissues,one could possibly save severely ill patients可知对动物冬眠的研究可能有助于使致命的病人的寿命延长,故选C.

点评 考查学生的细节理解和推理判断能力.做细节理解题时一定要找到文章中的原句,和题干进行比较,再做出正确选择.在做推理判断题时不要以个人的主观想象代替文章的事实,要根据文章事实进行合乎逻辑的推理判断.

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