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【单选题】
Most people think of lions as strictly African beasts, but only because they've been killed off almost everywhere else. Ten thousand years ago lions spanned vast sections of the globe, and so did people, who—as they multiplied and organized—put pressure on competitors at the top of the food chain. Now lions hold only a small fraction of their former habitat, and Asiatic lions, a subspecies that split from African lions perhaps 100,000 years ago, hang on to an almost impossibly small slice of their former domain. India is the proud steward of these 300 or so lions, which live primarily in a 560-square mile (1,450-square-kilometer) sanctuary. It took me a year and a half to get a permit to explore the entire Gir Forest—and no time at all to see why these lions became symbols of royalty and greatness. A tiger will slink through the forest unseen, but a lion stands its ground, curious and unafraid—lionhearted. Though they told me in subtle ways when I got too close, Gir's lions allowed me unique glimpses into their lives during my three months in the forest. It's odd to think that they are threatened by extinction Git has as many lions as it can hold—too many, in fact. With territory in short supply, lions prow] the periphery of the forest and even leave it altogether, often clashing with people. That's one reason India is creating a second sanctuary. There are other pressing reasons: outbreaks of disease or natural disasters. In 1994 canine distemper killed more than a third of Africa's Serengeti lions—thousand animals—a fate that could easily befall Girts cats. These lions, saved by a prince at the turn of the 20th century, are especially vulnerable to disease because they descend from as few as a dozen individuals. 'If you do a DNA fingerprint, Asiatic lions actually look like identical twins,' says Stephen O’Brien, a geneticist who has studied them. Yet the perils are hidden, and you wouldn't suspect them by watching these lords of the forest. The lions exude vitality, and no small measure of charm. Though the gentle intimacy of play vanishes when it's time to eat, meals in Gir are not necessarily frenzied affairs. For a mother and cub sharing a deer, or a young male relishing an antelope, there's no need to fight for a cut of the kill. Prey animals are generally smaller in Git than they are in Africa, and hunting groups tend to be smaller as well. The lions themselves aren't as big as African lions, and they have shorter manes and a long fold of skin on their undersides that many lions in Africa don't have. What impressed the author most when he went to watch the lions in the Gir Forest?
A.
The lions were on the brink of extinction.
B.
They were suffering from a fatal disease.
C.
They allowed him to see their vitality and charm at close quarters.
D.
Mother lion and her cub shared a deer.
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【简答题】设想有两个自由质点,其质量分别为m1和m2,它们之间的相互作用符合万有引力定律.开始时,两质点间的距离为l,它们都处于静止状态,试求当它们的距离变为 时,两质点的速度各为多少?
【多选题】设想有两个自由质点,其质量分别为 m 1 和 m 2 ,它们之间的相互作用符合万有引力定律.开始时,两质点间的距离为 l ,它们都处于静止状态
A.
两自由质点组成的系统在自身的引力场中运动时,系统的动量和机械能均守恒.
B.
两质点的间距变为 时,它们的速度分别为 及 .
C.
两自由质点组成的系统在自身的引力场中运动时,系统的动量 守恒 但机械能均不守恒.
D.
两自由质点组成的系统在自身的引力场中运动时,系统的动量和机械能均不守恒.
【单选题】以下信号中是差模信号的是( )
A.
温度变化
B.
电源电压波动
C.
电磁干扰
D.
音频信号
【单选题】神经系统疾病的症状按发病机制可分为
A.
感觉、运动、意识、自主神经功能障碍
B.
缺失症状、释放症状、刺激症状、断联休克症状
C.
感觉症状、意识、自主神经功能障碍、刺激症状
D.
缺失症状、运动症状、意识症状、刺激症状
E.
意识障碍、释放症状、刺激症状、休克症状
【简答题】神经系统疾病的研究内容包括()、()和()疾病。临床症状按其发病机制可分为()、()、()和()。
【单选题】连接钢轨与钢轨的联结零件是
A.
接头联结零件
B.
中间联结零件
C.
扣件
【多选题】神经系统症状按发病机制可分为
A.
缺损症状
B.
刺激症状
C.
释放症状
D.
休克症状
【单选题】以下信号中是差模信号的是( ) A. 温度变化 B. 电源电压波动 C. 电磁干扰 D. 音频信号
A.
温度变化
B.
电源电压波动
C.
电磁干扰
D.
音频信号
【判断题】钢轨间的联结叫接头联结,钢轨和轨枕的联结叫中间联结。
A.
正确
B.
错误
【简答题】按照 联结方式的不同可将钢轨联结分为接头联结和 __________ 两种方式
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