托福听力official9 The word “abundantly” in the passage is closest in meaning to 答案解析

abundantly: 丰富地，大量地。A是偶尔的；B是大量地，丰富地；C是有用地；D是幸运地。所以B的plentifully正确。对应原文:Lichens helped to speed the decomposition of the hard rock surfaces, preparing a soft bed of soil that was abundantly supplied with minerals that had been carried in the molten rock from the bowels of Earth.原句说lichens加快了岩石的分解，怎么样提供了岩石中的mineral，岩石分解了，岩石中的矿物会分散到土壤中，肯定就多了。A的occasionally说反；C和D完全不靠谱。