人类起重要支配作用，动植物种类很少，消费者主要是人类的生态系统是（）A、湿地生态系统

（）应当建立并有效执行介绍业务的合规检查制度。

A.证券公司

B.中国证监会

C.中国期货业协会

D.中国人民银行

一个分数的分子乘3，要使分数的大小不变，分母应除以3．______． （判断对错）

信号机制是解决进程同步和互斥的有效工具。实现进程间的互斥时，公用变量信号的初值一般设置为 (15) ；实现进程间的同步时，私用变量初值一般设置为 (16) 。

A．-2

B．-1

C．0或资源数目

D．1或资源数目

(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.

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

A．create a botanical garden where only exotic flowers grew

B．do a thorough study of plant structure

C．make a copy of one member of each United States flower family

D．show that glass are more realistic than wax flowers