如图是控制噪声的几种措施，其中属于在声源处减弱噪声的是[ ]

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问题选择题

摩托车的消音器

公路两旁的透明板墙

城市道路旁的隔音板

工厂用的防噪音耳罩

答案

答案：A

选择题

We _______go to the park if it _______rain tomorrow.

A． don’t,isn’t

B． don’t,stop

C． shall,doesn’t

D．aren’t,doesn’t

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单项选择题

(二)

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 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 artist-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 are kept in locked cases as they are too valuable and fragile for classroom use.

Which of the following statements is true of the flowers at Harvard University（）

A．They form a completed collection.

B．They have a marvelous fragrance.

C．They are loaned to schools for classroom use.

D．They use authentic representations.

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