Food Previous studies, however, told a different story. Craving is “all in our heads”， Science Daily once reported. When people desire a specific food, they keep imagining vivid images of that food, so that they have no brain power for any other task.

　　To reduce our desire for a chocolate bar, we need to focus our minds on other tasks, Science Daily said. For example, trying to imagine images of common sights or smells could kick those food images out of our minds. How about trying to imagine a rainbow instead? If that doesn?t work for us, at least we can use bacteria as a convenient excuse — “I need a can of soda, not for me, but for my gut bacteria！”

　　1．What do bacteria in your gut and stomach do, according to the article?

　　a．break down food

　　b．connect the stomach to the brain

　　c．block out harmful bacteria

　　d．change your eating behavior

　　A．ac　B．cd　C．abc　D．acd

　　2．What are the bacterias strategies to make people satisfy their needs?

　　A．They may change the way that the vagus nerve works.

　　B．They may make people feel hungry and think some foods are tastier than others.

　　C．They may change peoples facial expressions when eating some foods.

　　D．They may release some hormones to disturb peoples digestion systems.

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