题目内容：

　 As we know, Human beings each have unique brains. The brain is of the greatest importance to the body. It is the boss of the body．Your eyes，ears，nose，and skin tell your brain what is going on around you．Other parts of your body tell your brain what is going on inside of you．Your brain takes in the signals．It tells your body what to do with them．When you touch fire，your skin tells your brain that your finger is too hot．Your brain tells you to move your finger．All these happen very fast．Your brain also controls your breathing，blinking，and heartbeat．It controls your feelings and thoughts too．

　　Humans have the most developed brain of all animals．Yet it is not the largest brain．The human brain weighs three pounds．The brain of an elephant weighs 11 pounds．So the largest brain is not always the best brain．In people，a larger brain does not mean a clever person．

1.What is the main idea of this passage?

　 

A．The human brain works very fast．

B．The largest brain is not always the best brain．

C．The brain controls the body．

D．The best brain is the largest brain．

2.What happens after the brain takes in the signals from the body?

A．The brain grows faster and larger．	B．The brain tells the body what to do．
C．The body becomes more developed．	D．We don't know．

3.What does “the boss of the body” mean?

A．The signals．	B．The most developed body part．
C．The main part of the body.	D．The centre of the body．

4.Which brain is the most developed?

A．The largest brain．	B．The human brain．
C．The smaller brain．	D．Not too big brain．

5.What are the things that the human brain does?

　　A．Takes in signals．　　　　　　　B．Controls breathing．

　　C．Controls feelings and thoughts．　D．A，B and C．