题目

“中美轮胎特保案”启示我们，我国对外贸易必须改变那种依靠廉价劳动力、出售低端产品的粗放型增长方式。因此国内企业必须                                                     ①增强自主创新能力，提高产品科技含量  ②增加进口，减少出口 ③面向国际市场，调整产品结构          ④创立国际知名品牌，增加产品附加值 A．①②③ B．①②④ C．①③④ D．②③④Artificial(假的) 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 from natural flowers. In making such models, painstaking and artistry are called for, as well as thorough knowledge of plant structure. The collection of glass flowers in the Botanical Museum of Harvard University is the most famous in North America and is widely known throughout the scientific world. In all, there are several thousand models in colored glass, the work of two artist-naturalists, Leopold Blaschka and his son Rudolph.? The intention was to have the collection represent at least one member of each flower family native to the United States. Although it was never completed. It contains more than seven hundred species representing 164 families of flowering plants, a group of fruits showing the effect of fungus diseases, and thousands of flower parts and magnified details. Every detail of these is accurately reproduced in color and structure. The models are kept in locked cases as they are too valuable and fragile for classroom use.? Which of the following is the best title for the passage?? A. An Extensive Collection of Glass Flowers ? B. The Lives of Leopold and Rudolph? C. Flowers Native to the United States? D. Material Used for Artificial Flowers? It can be inferred from the passage that the goal of Leopold and Rudolph was to _______.? A. create a botanical garden where only exotic flowers grew? B. do a thorough study of plant structure? C. make a copy of one member of each United States flower family? D. show that glass are more realistic than wax flowers? The underlined word “it” refers to _______.? A. the intention　 B. the collection　　? C. one member      D. each flower family?