These plastic flowers look so _____ that many people think they are real,____they sell badly for the finanical crisis.

填入下面文段空白处的词语，最恰当的一组是（ ）有许多论文所引证的论述能够兼顾历史和科学前沿．________________________包括该领域中古老又权威的论断、方法和数据，________________________包括了最新研究成果及理论或实际需求，反映出作者的理论眼界。一位优秀的科学家________________________与当今学者的研究成果互相联系．且兼顾经典，________在研究其论文时不仅得到论点、论据．________________________能获得进一步探讨的方法与空间。

______ you see near the NorthPole is nothing but ice and snow.

There were not many people in the concertyesterday —Pop music isn’t ________

.They _________ that the books be returned to the school library at once.