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(新陳代謝的) 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 本文屬于記敘文閱讀,作者通過(guò)這篇文章向我們介紹了拉斯加黑熊每年冬眠七個(gè)月,而如今專家正在開(kāi)發(fā)使人類(lèi)進(jìn)入類(lèi)似冬眠的方法,這樣可以幫助宇航員在長(zhǎng)期的任務(wù)中生存,并為治療重癥病人提供新的方法.

解答 68.A  細(xì)節(jié)理解題,根據(jù)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個(gè)月.故選A.
69.D  主旨大意題,通讀全文可知本文主要向我們介紹了如今專家正在開(kāi)發(fā)使人類(lèi)進(jìn)入類(lèi)似冬眠的方法,使宇航員可以像熊一樣冬眠,故選D.
70.C  細(xì)節(jié)理解題,根據(jù)倒數(shù)第二段If our research could help by showing how to reduce metabolic(新陳代謝的) rates and oxygen demands in human tissues,one could possibly save severely ill patients可知對(duì)動(dòng)物冬眠的研究可能有助于使致命的病人的壽命延長(zhǎng),故選C.

點(diǎn)評(píng) 考查學(xué)生的細(xì)節(jié)理解和推理判斷能力.做細(xì)節(jié)理解題時(shí)一定要找到文章中的原句,和題干進(jìn)行比較,再做出正確選擇.在做推理判斷題時(shí)不要以個(gè)人的主觀想象代替文章的事實(shí),要根據(jù)文章事實(shí)進(jìn)行合乎邏輯的推理判斷.

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