48. Mirror neurons can explain ______.

A. why we cry when we are hurt              

B. why we cough when we catch a cold

C. why we smile when we see someone else smile

D. why we yawn when we see someone else get up late

49. The word “triggered” in Paragraph 3 probably means “______”.

A. set off                B. cut off                     C. broken out         D. found out

50. We can learn from the passage that mirror neurons _______.

A. relate to human behavior and communication    

B. decide our knowledge and language abilities

C. result in bad behavior and social disorders

D. control human actions and appearances

51. What is the passage mainly about?

A. Ways to find mirror neurons.                          B. Problems of mirror neurons.

C. Discovery of mirror neurons.                          D. Functions of mirror neurons.

参考答案48. C   49. A   50. A   51. D