The Japanese doctors find out that ______.
[A] our brains are aging too early [C] our brains are not getting enough exercise
[B] Japanese farmers are ageing at a relatively early age [D] Japanese farmers are losing their ability to think

A．The Japanese doctors find out that ______.
B．our brains are aging too early
C．our brains are not getting enough exercise
D．Japanese farmers are ageing at a relatively early age [D] Japanese farmers are losing their ability to think