The passage tells us that there is no difference between the flying fox and the ordinary bat in（）.

单项选择题It can be seen from the passage that （）.

A．the capacity to generate electricity is the distinctive characteristic of the fish
B．the current travels in an upward direction from the positive side to negative side in torpedo’s electric cells
C．some fish can produce enough electricity to drive a number of electric motors
D．the torpedo’ s electric cells have a shape with six sides

单项选择题According to the author, babies learn to do things which （）.

A．are directly related to pleasure
B．will meet their physical needs
C．will bring them a feeling of success
D．will satisfy their curiosity