Hints：
只听写例句。前面的单词不用听写。
这一期有两个例句哦。In Japan and elsewhere, the trees are planted to stabilize soil on steep mountain slopes.
Whatever their merits of demerits, the traditional organizations went into steep decline during the 1950's and 1960's. The old organizations lost the ability to maintain internal discipline.
发表于 2016-8-2 11:29:55