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【单选题】The California condor is the largest bird in North America. It is an endangered species. 20 years ago there were less than 30 birds left. All of the birds were trapped and kept in safe places. The num...
A.
shooting
B.
poisoning
C.
electrocution
D.
all of the above
【简答题】The factors that trigger migratory behavior in birds are difficult to explain. According to some scientists, migratory birds should be able to withstand the winter. A bird's feathery coat is good insu...
【简答题】Aggression in Humans and Animals 1 Man must be the most aggressive and cruel of all living creatures. We may say a violent man is behaving “ like a beast ” , but, in fact, no beast behaves as viol...
【单选题】Wetland losses have caused populations of some bird species — starved for water, food, and nesting sites — to ______________ by 60 to 80 percent.
A.
invest
B.
shrink
C.
expand
D.
persist
【简答题】The factors that trigger migratory behavior in birds are difficult to explain. According to some scientists, migratory birds should be able to withstand the winter. A bird’s feathery coat is good insu...
【简答题】Aggression in Humans and Animals 1 Man must be the most aggressive and cruel of all living creatures. We may say a violent man is behaving “ like a beast ” ,
but, in fact, no beast behaves as vio...
【简答题】The factors that trigger migratory behavior in birds are difficult to explain. According to some scientists, migratory birds should be able to withstand the winter. A bird's feathery coat is good insu...
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