Like infectious（有感染力的）laughter and crying, scientists have found that yawning is a shared experience that promotes social connection. Helt said it could fight stress after a period of being nervous and spread a feeling of calm through a group.

　　32．According to the first two paragraphs, what does the new study suggest?

　　A．Yawning is a form of communication.

　　B．It is easy to stop yawning when you see others yawn.

　　C．Children follow others in yawning just after they are born.

　　D．Yawning has some mysterious force which is related to God.

　　33．According to Molly Helt, __________.

　　A．humans differ from animals because they communicate with others

　　B．yawning is a kind of emotional connection among humans

　　C．emotions are infectious, but yawning is not

　　D．yawning helps clear ears on planes

　　34．Which of the following is NOT true about yawning?

　　A．It is natural to yawn back if people around you yawn.

　　B．Some kids are too young to yawn after others.

　　C．Yawning can be used to test children’s development.

　　D．Kids with autism yawn easily when others yawn.

　　35．The author implies in the last paragraph that __________.

　　A．yawning can make people feel relaxed

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