68. The underlined word “triggered”in the third paragraph probably means “ ”. (A) set off (B) cut off (C) built up (D) broken up

67. And the next time you feel the urge to cough in the cinema when someone else does----well, perhaps you will understand why. Mirror neurons can explain . (A) why we cry when we are hurt. (B) why we cough when we suffer from a cold (C) why we smile when we see someone else smile (D) why we yawn when we see someone else stay up late