Some bears hibernate in hollowed-out tree trunks. Some take a months-long rest beneath thick brambles and brush. Others dig into the hills to forge snug dens. And still others discover caves to hide away from the biting winter chill. ...
With changes in the availability and accessibility of food, polar bears are now staying on land for longer periods, which, some might mistakenly attribute to a sign of hibernation-related behavior, furthering the debate,do polar bears hibernate?
In which season do animals like bears often hibernate? A. Spring B. Summer C. Autumn D. Winter 相关知识点: 试题来源: 解析 D。解析:在冬季,一些动物如熊会冬眠,因为冬季食物短缺,通过冬眠来度过寒冷且食物匮乏的时期。春季动物苏醒,夏季动物活跃地觅食等,秋季动物为冬眠做准备。
Why Do Bears Hibernate? by Darice Bailer (Tell Me Why, Tell Me How series) (eBook)Bailer, Darice
One of the most interesting characteristics of bears including the black bear is their winter sleep. Unlike many other animals bears do not actually hibernate(冬眠). Although the bear does not eat during the winter months its temperature remains almost normal and it breathes regularly four or ...
Polar bears do not hibernate. Only pregnant polar bears den. Unlike hibernation, a polar bear's heart rate and temperate do not decrease, this ensures the
Bear hibernation is part of a bear's annual cycle of activity, when its metabolic systems change and activity pauses for a period of time varying with the habitat's climate. Grizzly bears hibernate for 5–7 months each year. But it isn't as clear-cut as curling up and going to sleep ...
答案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...
(3)F.根据文中第三段Unlike brown and black bears,polar bears do not hibernate during the winter.Only female polar bears will go into a "little house" and stay for a long time if they are giving birth to baby bears,与棕熊和黑熊不同,北极熊在冬天不冬眠。只有雌性北极...
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...