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参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】It seems hard to watch someone yawn and not to yawn ourselves. Even reading about yawning can make you do it. Now, a new study has found why yawning has such a powerful force. Yawning when others yawn...
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.
【单选题】儿童自闭症是一种()
A.
由语言发育障碍引起的慢性疾病
B.
因发音器官病理变化所引起的发音困难的疾病
C.
神经系统发育障碍引起精神障碍性疾病
D.
因长期营养不良，躯体发育缺陷障碍所致的疾病