单选题 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.

单选题 Natural history exhibits differ from art exhibits in that they ______.

【正确答案】 C

【答案解析】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”。

单选题 Models are built larger than life to ______.

【正确答案】 B

【答案解析】本题是一道具体细节题。问展品模型制作得比实物大的目的是什么。利用查阅式阅读法，我们可以在文章第三段的第三句话和第四句话中找到相关内容。这两句话指出，比如，当某个生物小到无法看清楚时该怎样展出呢?遇到这种情况，需要制作比实物大的模型。因此，本题的正确答案应是B“以展示那些实物展品中看不到的细节部分”。

单选题 According to the passage, which of the following is NOT true?

A、 Exhibits in a natural history museum have to be enlarged up to seventy-four times.
B、 An art museum buys its exhibits while a natural museum often has to construct its exhibits.
C、 Models are displayed to show the insects" development and the workings of their bodies.
D、 Photographs and measurements are taken of animals so as to make the model appear more realistic.

【正确答案】 A

【答案解析】本题是一道判断是非题。问按照文章内容，下面哪个选项是不正确的。我们可以针对四个选项所给的内容，利用查阅式阅读法和排除法结合原文信息找出本题的正确答案A“自然历史博物馆中的展品必须放大为实物的74倍”。文章中在第三段倒数第二句话中提到了美国自然历史博物馆里有将原物放大多达74倍的跳蚤、家蝇和无数其他昆虫标本。但并不表明所有的展品都需要放大74倍。其他选项B、C和D的内容在文章中都有涉及，是符合文章原文内容的选项，因此，都不是本题的正确答案。

单选题 The best title for this passage is ______.

【正确答案】 B

【答案解析】本题是一道涉及全文最佳标题类的问题。根据文章内容，我们可以总结归纳出本文的中心思想和主题，从而推断出本文的最佳标题应是展示自然历史的困难和问题。因此，本题的正确答案应是B。

单选题 It is implied but not clearly mentioned in the passage that ______.

【正确答案】 B

【答案解析】本题是一道暗示推断题。问下面四个选项中哪个是文章中暗示出来而没有明确提到的。通读全文后我们可以推知本题的正确答案应是B“自然历史博物馆中的东西都不是活的”。
选项A“一些生物无法展示”在文章中没有提到，也无法推断出来。C“陨石来自于外层空间”，文章中根本没有提到关于陨石的出处问题，所以也无法推断。D“自然历史类展品通常必须制作出来”，这个内容是文章中明确提到的。因此，这三个选项都是错误的。