阅读下面短文，从每题所给的四个选项(A、B、C和D)中，选出最佳选项，并在答题卡上将该项涂黑。

　　Man-made flowers are used for scientific as well as for decorative(装饰的) purposes. They, are made from a variety of materials, such as wax and glass, so skillfully that they can hardly be recognised from natural flowers. In making such models, painstaking skill and imagination are called for, as well as thorough knowledge of plant structure(构造). 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 invention was to have the collection stand far at least one member of each flower family native to the US. Although it was never completed, it contains more than seven hundred species standing for 164 families of flowering plants, a group of fruits showing the effect of fungus(真菌) diseases, and thousands of flower parts and fine details. Every detail of these is reproduced in color and structure. The models are kept in locked cases, as they are too valuable and fragile(易碎的) for classroom use.

1．Which of the following is the best title for the passage?

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A．Natural flowers and, man-made flowers

B．Lives of Leopold and Rudolph

C．Models for flowers native to the US

D．Materials used for man-made flowers

2．Which of the following statements about Leopold and Rudolph is true?

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A．They were brothers.

B．They were artists.

C．They were fathers.

D．They were farmers.

3．It can be inferred from the passage that the goal of Leopold and Rudolph was to ________.

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A．build a botanical garden where only strange and rare flowers grew

B．do a thorough study of plant structure

C．make a copy of one member of each US flower family

D．show that glass flowers are more realistic than wax flowers

4．Man-made flowers are not mentioned of their ________ purposes in the passage.

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