According to some doctors, one of the ways to prevent us from growing old is to make sure that our brains get enough___.

A. performance　　 B. exercise　　　 C. experience　 D. sport

According to some doctors, one of the ways to prevent us from growing old is to make sure that our brains must get enough ________．

1. A.
   exercise
2. B.
   rest
3. C.
   sport
4. D.
   experience

. According to some doctors, one of the ways to prevent us from growing old is to make sure

that our brains get enough___.

A. performance     B. exercise       C. experience    D. sport 

. According to some doctors, one of the ways to prevent us from growing old is to make sure

that our brains get enough___.

A. performance     B. exercise       C. experience    D. sport 

.

 According to some doctors, one of the ways to prevent us from growing old is to make sure

that our brains get enough___.

A. performance     B. exercise       C. experience    D. sport