【单选题】Artificial flowers are used for scientific as Well as for decorative purposes. They are made from 【B1】 of materials, such as wax and glass, so skillfully that they can scarcely be 【B2】 from natural fl...
【单选题】Artificial flowers are used for scientific as well as for decorative purposes. They are made from a variety of materials, such as wax and glass, so skillfully that they can scarcely be distinguished f...