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  3. When an art museum wants a new exhibit, it buys things in finished form and hangs them on its walls. When a natural history muse

When an art museum wants a new exhibit, it buys things in finished form and hangs them on its walls. When a natural history muse

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问题     When an art museum wants a new exhibit, it buys things in finished form and hangs them on its walls. When a natural history museum wants an exhibit, it often must build it realistically— from a mass of material and evidence brought together by careful research.
    An animal, for example, must first be skinned. Photographs and measurements are used to determine the animal’s structure in a natural position fighting, resting, or feeding. Then muscle forms are built and a plaster shell is made. Finally the skin is pulled over the shell like a wet glove. This completes the animal subject.
    Displaying such things as stone heads, giant trees, and meteorites (陨石，陨星) is basically mechanical. Most other natural history exhibits present more difficult problems. For instance how can a creature be exhibited when it is too small to be seen clearly? In these cases larger-than-life models are built. The American Museum of Natural History has models of fleas (跳蚤), houseflies and a myriad (无数的) of other insects enlarged up to seventy-four times. The models show the stages of the insects’ development and the workings of their bodies.
Natural history exhibits differ from art exhibits in that they______.
选项 A、are bought
B、are not displayed to the public
C、often must be constructed
D、do not require research
答案C
解析 本题是一道具体细节题。问自然历史博物馆的展品与艺术博物馆的展品有何不同。根据文章第一段的内容，当艺术博物馆需要一件新展品时，它可以直接购买成品，再把购买来的成品挂在墙上即可。而当自然历史博物馆需要展品时，它则通常需要依据仔细研究而集中起来的大量材料及证据来逼真地制作这些展品。由此我们可以推知，本题的正确答案应是C“自然历史博物馆所需的展品通常必须自己制作”。
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