_________（48）A.For an adult time goes fast year b
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_________（48）
A.For an adult,time goes fast year by year.
B.It controls,for example,the flapping of birds’ wings,the beating of the heart and the rising and setting of the sun.
C.The larger the animal is,the longer its life span is and the slower its life tempo is.
D.The tide goes out when the moon moves away and its attraction is weaker.
E.We always tend to think all the animals have the same sense of time as human beings.
F.The second spring tide takes them back to the sea.
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答案：F
本空前文提到：生长在潮汐地区的动物具有预测潮汐的本能。然后以国王螃蟹为例。螃蟹远离海岸产卵，并将之埋在沙下，防止食肉鱼吞食。到第二次春潮来临时，小螃蟹已破壳而出。选项F第二次春潮会把他它们带回大海，其中出现second spring，这是与上一句联系的信号。从内容上看，它是上一句意思的自然发展。所以选项F是正确答案。