Chrome，
QQ浏览器
.
![人教生物七下《1.1人类的起源和发展》[孙老师]『市一等奖』优质课](http://imgshow.1ydt.com/img?url=%2F%2Fi2.hdslb.com%2Fbfs%2Farchive%2F3c8b043647cf09023de48abc5cbcdf579b88faf1.jpg%40672w_378h_1c_%21web-search-common-cover)
![人教生物七下《1.2人的生殖》[王老师]『市一等奖』优质课](http://imgshow.1ydt.com/img?url=%2F%2Fi0.hdslb.com%2Fbfs%2Farchive%2F068d7f15c0176c11356afc630dba56744a94222f.jpg%40672w_378h_1c_%21web-search-common-cover)
.