摘要
Directions:Read the following passage.Answer the questions according to the information given in the passage and the required words limit. Even bird brains can get to know an entire continent--but it takes them a year of migration to do so,suggests a Princeton research team.
Directions： Read the following passage. Answer the questions according to the information given in the passage and the required words limit.
Even bird brains can get to know an entire continent--but it takes them a year of migration to do so, suggests a Princeton research team.
