B

　　[2016·保定摸底考试]

　　We all know what a brain is. A doctor will tell you that the brain is the organ of the body in the head. It controls our body's functionsW1, movements, emotions and thoughts. But a brain can mean so much more.

　　A brain can also simply be a smart person. If a person is called brainy, she is smart and intelligent. If a family has many children but one of them is super smart, you could say, “She's the brains in the family.” And if you are the brains behind something you are responsibleW2 for developing or organizing something. For example, Bill Gates is the brains

　　behind

　　Microsoft.

　　Brain trust is a group of experts who give advice. Word experts say the phrase “brain trust” became popular when Franklin D. Roosevelt first ran for president in 1932. Several professors gave him advice on social and politicalW3 issues facing the US. These professors were called his “brain trust.”

　　These ways we use the word “brain” all make senseP1. But other ways we use the word are not so easy to understand. For example, to understand the next brain expression, you first need to know the word “drain”.

　　As a verb,

　　to drain means to remove something by letting it flow away. So a brain drain may sound like a disease where the brain flows out the ears.S But, brain drain is when a country's most educated people leave their countries to live in another.

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