Howdidzebrasgettheirstripes?It’shardtogetablack-and-whi...

問題詳情：

How did zebras get their stripes? It’s hard to get a black-and-white answer. Some scientists say the stripes are a form of camouflage (偽裝)，___61___  protects zebras from hungry lions. Others say they’re key to zebras’ mating rituals. Research___62___ (publish) last year, suggesting that the stripes drive biting flies, thus__63__ (protect) the animals from diseases flies sometimes carry.

But a peculiar new study offers yet another possible__64__ (explain): the stripes help the zebras stay cool in their sometimes hot habitats.

“It was discovered__65__ temperature is an important predictor of how stripy plains zebras are,” Dr. Brenda Larison, ­­___66___ assistant researcher at the University of California, Los Angeles__67___ the study’s lead author, told The Huffington Post in an email.“Zebras in areas with seasonal cold temperatures are less stripy than__68__ in areas with continuous warm temperatures.”

For the study, the researchers analyzed variations in the stripes seen in plains zebras at 16 sites in Africa. The researchers then examined the relationship ___69___ the stripe patterns and 29 environmental variables.

What did the analysis show? The extent of stripes is related more __70__ (close) to hot weather than to other environmental variables. In other words, the hotter their habitats are, the more stripes zebras tend to have.

【回答】

61. which   62. was published  63. protecting   64. explanation  65. that    

  66. an    67. and     68. those    69. between   70. closely                                                        

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