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问题 判断题

动物的学习行为一旦形成，就不会改变                                （   ）

答案

错

题目分析：先天性行为是在遗传的基础上形成的行为，是生来就有的，而学习行为是在遗传因素的基础上，通过环境因素的作用，由后天生活经验和学习而获得的行为．当刺激该行为产生的环境因素去除后，该行为会消失．

单项选择题

For nearly ten years, the Unified Modeling Language (UML) has been the industry standard for visualizing, specifying, constructing, and documenting the（）of a software-intensive system. As the（）standard modeling language, the UML facilitates communication and reduces confusion among project（）. The recent standardization of UML 2.0 has further extended the language’s scope and viability. Its inherent expressiveness allows users to（）everything from enterprise information systems and distributed Web-based applications to real-time embedded systems. 　　The UML is not limited to modeling software. In fact, it is expressive enough to model（）systems, such as workflow in the legal system, the structure and behavior of a patient healthcare system, software engineering in aircraft combat systems, and the design of hardware. To understand the UML, you need to form a conceptual model of the language, and this requires learning three major elements: the UML’s basic building blocks, the rules that dictate how those building blocks may be put together, and some common mechanisms that apply throughout the UML.

As the（）standard modeling language.

A．real

B．legal

C．de facto

D．illegal
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单项选择题

空气中氧气浓度降至（）%时，人会感觉呼吸急促，脉搏跳动加快，失去劳动能力。

A.18

B.16

C.15

D.12
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