Ⅲ.综合运用

Why Do We“Catch”a Yawn？

If seeing someone yawn（打哈欠）makes you yawn as well，you are not a__1__.In fact，60 to 70 percent of people find that seeing a person yawn in real life or on a photo or even reading about it will make them do the s__2__thing.

While many animals can also yawn，only a few of them c__3__yawns like humans.Why is yawning so contagious（有传染性的）？

Catching yawns may be a sign that you are a__4__by other people's feelings.Just like you might smile at someone when they do the same to you.Scientists found in a s__5___that most children did not begin the“contagious yawning”until they were around four years old，generally the age when empathy（共鸣；同感）begins to develop.

The study also found that young people with autism（自闭症），who may have trouble f__6__empathy，were less likely to yawn contagiously than their peers（同龄人）without autism.The study showed that the less empathy a person had，the less l__7__he or she was to catch a yawn.

1.a____________2.s____________3.c____________4.a____________5.s____________6.f____________7.l____________