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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. Now lions hold only a small fraction of their former habitat, and Asiatic lions, a subspecies that spit from African lions perhaps 100,000 years ago, hang on to an almost impossibly small slice of their former territory.
India is the proud steward of these 300 or so lions, which live primarily in a 560-square-mile sanctuary (保护区). 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 hide in 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; Gir has as many lions as it can hold--too many, in fact. With territory in short supply, lions move about near the boundary 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 1994a serious disease killed more than a third of Africa’s Serengeti lions a thousand animals--a fate that could easily happen to Gir’s cats. These lions are especially vulnerable to disease because they descend from as few as a dozen individuals. "If you do a DNA test, Asiatic lions actually look like identical twins, "says Stephen O’Brien, a geneticist (基困学家) who has studied them. Yet the ers are hidden, and you wouldn’t suspect them by watching these lords of the forest. The lions display 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 frantic affairs. For a mother and her baby lion sharing a deer, or a young male eating an antelope (羚羊), there’s no need to fight for a cut of the kill. The animals they hunt for food are generally smaller in Git than those in Africa, and hunting groups tend to be smaller as well.
One of the reasons why India is creating a secondary sanctuary for the Asiatic lions is that ______.

A.
the present sanctuary is not large enough
B.
scientists want to do more research on them
C.
they have killed many people
D.
the forest is shrinking in size
题目标签:羚羊保护区
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【单选题】建立自然保护区的目的是______。

A.
保护濒临灭绝的动物
B.
保护生物多样性和各种生态系统
C.
保护具有药用价值的植物资源
D.
保护自然遗迹、发展旅游业

【单选题】自然保护区的功能分区为( )。

A.
核心区、缓冲区、生态旅游区
B.
核心区、实验区、生态旅游区
C.
核心区、缓冲区、经营区
D.
核心区、缓冲区、实验区

【单选题】Large animals that inhabit the desert have evolved a number of adaptations for reducing the effects of extreme heat. (31) adaptation is to be light in color, and to (32) rather than absorb the sun...

A.
Another strategy (37) large desert animals is to tolerate the loss of body water to a point (38) would be fatal for non-adapted animals. The camel can lose up to 30 percent of its body weight (39) water without harm to itself, (40) human beings die after losing only 12 to 13 percent of their body weight. An equally important adaptation is the ability to (41) this water loss (42) one drink. Desert animals can drink prodigious’ volumes in a short time, and camels have been known to (43) over 100 liters in a few minutes. A very dehydrated person, (44) , cannot drink enough water to rehydrate at one (45) , because the human stomach is not sufficiently big and because a too rapid (46) of the body fluids causes death from water intoxication. The (47) of water loss is of obvious advantage in the desert, as animals do not have to remain (48) a water hole but can obtain food from grazing sparse and far-flung pastures. Desert-adapted mammals have the (49) ability to feed normally when extremely dehydrated; it is a common experience in people that appetite is lost even (50) conditions of moderate thirst.