Artificial（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 skill-fully 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. 【选项】 1. 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 2. 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 flowers are more realistic than wax flowers 3. The underlined word "it" refers to __________. A. the intention B. the collection C. one member D. each flower family 4. Which of the following is NOT included in the display at the Botanical Museum of Harvard University? A. Models of 164 families of flowering plants. B. Magnified details of flower parts. C. Several species of native birds. D. A group of diseased fruits. 5. Which of the following statements is TRUE of the flowers at Harvard University? A. They form a completed collection. B. They have a marvelous fragrance. C. They are loaned to schools for classroom use. D. They use authentic representations.