读地球仪示意图,回答下列问题
通常用来作为菌种鉴定的重要依据是( )
如图,在半径为2的⊙O中,两个顶点重合的内接正四边形与正六边形,则阴影部分的面积为____ .
Their clothes were ______ colorful ________ I could not stop taking photos.