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  3. Artificial flowers are used for scientific as well as for decorative purposes. They are made from a variety of materials, such a

Artificial flowers are used for scientific as well as for decorative purposes. They are made from a variety of materials, such a

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问题     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 from natural flowers. In making such models, painstaking skill 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 artists-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 ate kept in locked cases, as they are too valuable and fragile for classroom use.
In line 2 (Pare. 2), the word "it" refers to which of the following phrases?
选项 A、the intention (line 1)
B、the collection (line 1)
C、one member (line 1)
D、each flower family (line 1)
答案B
解析 此处考察代词的指代用法。It指前一句的表语从句，to have the collection represent at least one member of each flower family native to the United States。
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