问题
单项选择题
下列工具中为需求分析常用工具的是 ______。
A．PAD
B．PFD
C．N-S
D．DFD
答案
参考答案：D
解析：[评析] 常见的需求分析方法有：结构化分析方法和面向对象的分析方法。结构化分析的常用工具有：数据流图(DFD)、数据字典(DD)、判定树和判定表等。
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下列工具中为需求分析常用工具的是 ______。
A．PAD
B．PFD
C．N-S
D．DFD
参考答案：D
解析：[评析] 常见的需求分析方法有：结构化分析方法和面向对象的分析方法。结构化分析的常用工具有：数据流图(DFD)、数据字典(DD)、判定树和判定表等。
| Since life began eons ago, thousands of creatures have come and gone. Some, such as the dinosaurs, became extinct due to naturally changing ecologic conditions. More recent threats to life forms are humans and their activities. Man has drained marshes, burned prairies, dammed and diverted rivers. Some of the more recent casualties of man’s expansion have been the dodo, great auk, passenger pigeon, Irish elk, and Steller’s sea cow. Sadly, we can no longer attribute the increasing decline in our wild animals and plant species to "natural" processes. Many species are dying out because of exploitation, habitat alteration or destruction, pollution, or the introduction of new species of plants and animals to an area. As mandated by Congress, protecting endangered species, and restoring them to the point where their existence is no longer jeopardized, is the primary objective of the U.S. Fish and Wilidlife Service’s Endangered Species Program. |
Which of the following would be a likely theme for the next paragraph
A．Naturally changing ecological conditions
B．Animals that have become extinct
C．Achievements of the government Endangered Species Program
D．Programs that have destroyed natural habitats