_________（49）A.For an adult time goes fast year b

_________（49）

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.