【参考答案】64、CAB

　　阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项。Most parents possess consciousness of security(安全意识) but Australian wrens(鹪鹩They have no choice: mother wrens often have their nests hijacked by cuckoos(布谷鸟).

　　Cuckoo eggs look like wren eggs but hatch(孵化) earlier, at which point cuckoo chicks eject (驱逐)wren eggs. Unless the mother wren realizes an intruder(侵入者) is in the nest, she raises the cuckoo chick as her own, wasting time and food. But the cuckoo only gets away with it in 60% of the cases. In the other 40% of the cases, the mother wren detects the cuckoo within days, abandons it, and starts another nest. That’s because the mother wren teaches her chicks a password while they are still inside their eggs. Once they are hatched, the mother wren abandons the nest if they can’t give the password.

　　Sonia Kleindorfer of Flinders University in Adelaide, Australia and his colleagues recorded the sounds made by birds near the wren’s nests. Mother wrens made a particular call made up of 11 elements while incubating(孵化)the eggs, and then stopped when they hatched. One of the 11 elements was a note of a particular length and tone that was unique to wrens.

　　【参考答案】67、CBDA

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