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在页面中为id值为box的div元素添加名称为blue的 CSS类，代码为___________________。

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从匹配的元素中删除指定的CSS类使用的是________________方法(仅写方法名)。

在页面中删除id为B的元素下的所有子节点的代码为________________。

如果将页面中所有的div元素都设置为绿色，实现的代码是_________________。

Traveling solo—A blessing overall!You are ready to travel. But You haven’t traveled much and have many problems to deal with. of your friends or families that dream. You could though it is a difficult decision. I traveled solo to China and after that to several other countries. My friends, acquaintances, co-workers and the natives from the countries I visited consider it _, ________, _ and __.My solo travel has been sometimes a _, sometimes a _. Not-so-pleasant experiences in Indonesia, Japan, Italy, China have shown that traveling solo could also put me _. Having a companion might have ___ me _ some dangers, but it would have made me lose the opportunities to enjoy the trip, eat _____, be by strangers, meet _in the trip.But you have to be careful not to endanger yourself by throwing _to the wind. _____, close your eyes and leap in! Everything that happens to you will you in some way. Don’t ever let a lack of companionship _you from doing traveling solo because traveling solo is a blessing overall.