An alternative strategy that birds use to deal with food scarcity is to forage (四处搜寻) in flocks, because a group is more likely to find a new source of food than a lone individual.

　　“If you are faced with food scarcity, you have two options,” Boyle said. “You can either forage with other birds, or you can migrate.”

　　51. The passage mainly tells us ________.

　　A. the real reason for birds’ migration

　　B. food scarcity that birds face today

　　C. how birds search for food

　　D. when birds migrate

　　52. The scientists used to believe that birds migrate because ________.

　　A. they want to search for the food they like

　　B. they can find more food in a different place

　　C. they can breed their young in a different place

　　D. the weather turns too cold

　　53. The researchers constructed a “supertree” mainly to ________.

　　A. compare the sizes of different birds

　　B. make out the relationships between different birds

　　C. find out what causes birds to leave each season

　　D. predict when the birds were migratory

　　54. Which of the following is true?

　　A. All birds fly to non-breeding areas each year.

　　B. There are 379 species of birds migrating.

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