![NorthAmericanbackbearsareshyanimals.Theyarefearfulbynat...]( "NorthAmericanbackbearsareshyanimals.Theyarefearfulbynat...")
- 问题详情：NorthAmericanbackbearsareshyanimals.Theyarefearfulbynature,andwillusuallyrunawayiftheyseeorhearpeople.Becauseofthis,itcanbedifficultforscientiststolearnabouttheseanimals.Inordertostudyblackbears,researchersfromNewJersey,USA,catchbearsandusedr...
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