【正文】
_____. A. the effects of laughter associated with humour B. the human body and stress C. scientifis methods used in laboratories 2. Scientists haven’t measured the positive effects of laughter on ________ A. adults B. teenagers C children ’s not easy for doctors to use humour at work because____ want to be authority figures may not take them seriously don’t think it would have any value you can’t find during a humour campaign are _______ meals in the humour rooms and performers TV channels and programmes you study , laughter helps your brain to ________ asleep faster attention and stay active stress after the exam Step VI 語法練習 D級 was very tired after she ___