2. 外语
  3. Artificial flowers are used for scientific as well as for decorative purposes. They are made from【C1】______of materials, such as

Artificial flowers are used for scientific as well as for decorative purposes. They are made from【C1】______of materials, such as

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问题     Artificial flowers are used for scientific as well as for decorative purposes. They are made from【C1】______of materials, such as wax and glass, so skillfully that they can scarcely be【C2】______from natural flowers. In making such models, painstaking skill and artistry are called for, 【C3】______thorough knowledge of plant structure. The【C4】______of glass flowers in the Botanical Museum of Harvard University is the most famous in North America and is widely known【C5】______the scientific world. 【C6】______, there are several thousand models in colored glass, the work of two artist-naturalists, Leopold Blalschka and his son Rudolph.
    The intention was to have the collection【C7】______at least one member of each flower family native to the United States. 【C8】______it was never completed, it contains more than seven hundred species representing 164 families of flowering plants. 【C9】______detail of these is accurately reproduced in color and structure. The models are【C10】______in locked cases as they are too valuable and fragile for classroom use.
【C5】
选项 A、through
B、throughout
C、over
D、on
答案B
解析 本题要求填入确切的介词，与后面的the scientific world一起构成一个地点状语。B项throughout指“遍及”，后接the scientific world时，意为“全科学界”，是正确答案。A项through表示“通过；以……”不符合句意，C项over与all连用时，表示“遍及”，因此也不能选用。D项on表示“关于”，与句意相差更远。
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