問題詳情

Madagascar’s fabulously improbable wildlife, from gremlin-like aye-ayes tosatanic leaf-tailed geckos, may be thanks to dozens of dramatic oceanic journeys thatwould put Robinson Crusoe to shame, new research says. 
       “It seems like a far-fetched idea that animals could survive drifting across thesea, because it’s hard enough for humans to survive that, let alone animals,” saysMatthew Borths, a curator of fossils at Lemur Center at Duke University.        But a comparison of genetic data from modern Malagasy species with the fossilrecord of their ancestors from the African mainland has revealed that this is likelywhat happened for most land vertebrates, according to the research, published in Mayin the journal Biological Reviews.       Reptiles, amphibians, and mammals from mainland Africa would have beenstranded on giant rafts of vegetation and floated to Madagascar, where theyeventually evolved into the wildlife we know today. Some 95 percent of mammalsand 98 percent of reptiles are endemic to the country, which means they live nowhereelse in the world.       While it seems improbable for animals to survive the roughly 30 to 35 days itwould have taken to get across the Mozambique Channel, the vegetation may haveheld fruits or other food sources, as well as trapped rain to keep the animals alive.       “With geological time, something which is statistically unlikely or highlyunlikely becomes a certainty. If you keep throwing the dice for five million years,eventually you’re going to come up with 10 sixes,” says study co-author Jason Ali,a geophysicist at the University of Hong Kong.
【題組】46. Which of the following is the best title for this passage?
(A)Why is Madagascar’s wildlife so unique?
(B)How to cross the Mozambique Channel in 30 days.
(C)Colonialism and Madagascar’s wildlife.
(D)Indigenous species 101.

參考答案

答案:A
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