[单项选择]There are currently three living species of elephants: the African Bush Elephant, the African Forest Elephant and the Asian Elephant or Indian Elephant. Other species such as the mammoths (猛犸象) 16 before the last ice age but are now 17 . Elephants live in a structured social order. 18 females spend their entire lives in tight-knit family groups 19 mothers, daughters, sisters and aunts, males live mostly solitary lives. Elephants 20 live for 50 to 70 years. The elephant’s pregnant period is 22 months, the longest of 21 land animal. Newborn elephant calves weigh 22 260 pounds. Elephants spend about 16 hours a day finding and eating food. Their diet consists 23 grasses, leaves, bamboo, twigs, bark, roots and small amounts of fruits, seeds and flowers. Interestingly, elephants only digest 40% of 24 they eat; an adult elephant can consume 300-600 lb of food a day. Elephant skin
A. supply of
B. call for
C. cost of
D. desire for

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[单项选择]There are currently three living species of elephants: the African Bush Elephant, the African Forest Elephant and the Asian Elephant or Indian Elephant. Other species such as the mammoths (猛犸象) 16 before the last ice age but are now 17 . Elephants live in a structured social order. 18 females spend their entire lives in tight-knit family groups 19 mothers, daughters, sisters and aunts, males live mostly solitary lives. Elephants 20 live for 50 to 70 years. The elephant’s pregnant period is 22 months, the longest of 21 land animal. Newborn elephant calves weigh 22 260 pounds. Elephants spend about 16 hours a day finding and eating food. Their diet consists 23 grasses, leaves, bamboo, twigs, bark, roots and small amounts of fruits, seeds and flowers. Interestingly, elephants only digest 40% of 24 they eat; an adult elephant can consume 300-600 lb of food a day. Elephant skin
A. remained
B. stayed
C. existed
D. appeared

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[单项选择]

Man finds living together with his own species(物种)difficult enough and living together with other species almost impossible. Our usual solution is to kill off anything that get in our way. Even on those rare occasions when we do enter into a relationship with another species, it is heavily biased(带有倾向)in our favor. The other species benefits only when it suits our own interests. Our attempts to communicate with another species are concerned mainly with giving orders in our own language and having them obeyed Probably our best attempt has been the whistle language that is used in the shepherd-sheepdog relationship. This is a system that is natural to neither species, but one that both can understand. Its only fault lies in fact that the bias is still there--the dog cannot whistle for the man.
But now comes news of a piece of research that prom
A. tries to communicate with them
B. tries to teach them a language
C. sets up a relationship with them
D. wipes them out

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