Scientists started thinking that the human brain could develop and change when they studied animals' brains. They found out that animals that lived in a challenging environment were more “perspicacious” — they were better at solving problems and learning new things.

　　1．According to the first paragraph，________.

　　A．the function of our brain is like that of the muscle

　　B．until now it's impossible to explain the brain's mystery

　　C．many people believe one's intelligence is naturally determined

　　D．one's brain grows stronger as the age increases

　　2．Training muscles is compared to ________.

　　A．using the brain

　　B．connecting things in your brain

　　C．lifting weights

　　D．doing research about the brain

　　3．What is Paragraph 3 mainly about?

　　A．The complex structure of the brain.

　　B．How changes in the muscles affect the brain.

　　C．The importance of the brain.

　　D．How the brain becomes stronger by learning new things.

　　4．What does the underlined word “perspicacious” in the last paragraph probably mean?

　　A．Strong. B．Smart.

　　C．Popular.

　　D．Active.

　　B

　　(2014·常州质检)

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