【单选题】He has many works of William Shakespeare, but only one is ______.
【单选题】In this area open-mining has ______ the natural scenery.
【简答题】已知甲、乙两箱中装有同种产品,其中甲箱中装有3件合格品和3件次品,乙箱中仅装有3件合格品.从甲箱中任取3件产品放入乙箱后,求: (Ⅰ)乙箱中次品件数的数学期望; (Ⅱ)从乙箱中任取一件产品是次品的概率.
【单选题】在现代货币制度下,纸币的职能是来自于( )