题目内容：

Many Chinese believe   31      (eat) pig brains will increase their intelligence and some Americans regularly eat   32   ___ (cook) eggs to keep their minds sharp.   33     , doctors don’t recommend eating   34        raw eggs or animal brains. Then, what food is good for your brain? Scientists have found a relationship  35 ____ diet and a healthy brain. Generally speaking, fish is a brain food.   36 ____ fish, you should introduce lots of dark green leafy vegetables and colorful fruits into your diet, because most people lack the special vitamins  37     these brain food provide. If you eat brain foods   38   ____ (regular), they can increase brain power — help you pay attention, keep you  39     ___________ (motivate), improve your memory and  40   _____( less) stress from studies. Then you can do much better in your test.