放风筝成为一项很受欢迎的户外活动.__ __became a very popular outdoor activity.

问题描述:

放风筝成为一项很受欢迎的户外活动.__ __became a very popular outdoor activity.

现在七年级下册的新教材上面也是写的kite flying,所以尽可能的以书本为标准来写,这样老师也不好打你错的.