阅读理解。阅读下列短文, 从给的四个选项 (a、b、c和d) 中, 选出最佳选项。
tang poetry is so excellent and of such a large sum that it is a precious cultural heritage of chinese civilization in ancient time.it appeals so many people all over the world that more and more tang poems have been translated into other languages，mostly into english.nevertheless，since the translatability of poetry has been the most controversial(引起争论的)issue in the translation circle，whether a tang poem is translatable or not is now still in debate.
an american poet robert frost ever said，“
