r______ come up with sudden laughter

The cues that trigger laughter have been studied by scientist.

Doctors have proved the following EXCEPT that （） A: smiling does good to health B: laughter can be tolerated C: there is a way to reduce pain D: laughter can work the muscles in the feet

Doctors hold laughter clinics（） A: to give better condition to their patients B: in order to improve patients' health C: to make patients smile D: to prove smile and laughter have the same effect

The purpose of doctors holding laughter clinics is ______. A: to give better condition to their patients B: to improve patients' health C: to make patients smile D: to prove smile and laughter }lave the same effect

It has been proved all of the following except that ______. A: smiling does good to health B: laughter can produce pain C: there is a way to reduce pain D: laughter can work the muscles in the feet

What surprised me was that she stared at me for a moment and then _______ laughter suddenly.

She stood there, shaking with fury. （） A: misery B: laughter C: anger D: cry

She stood there, shaking with fury. A: mystery B: laughter C: anger D: cry

It is well known that laughter has a tonic effect on the mind and body, suffusing the body with a feeling of well-being.