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【背景材料】古今建筑工程公司承接了龙山职业技术学院科技大楼，该公司为了保证程施工质量根据《建筑工程施工质量验收统一标准》对大楼施工提出了下列要求进行验收。

涉及结构安全的（）应按规定进行见证取样检测。

A.试块

B.试样

C.试件

D.辅助材料

E.有关材料

答案

参考答案：A, C, E

选择题

下列叙述不正确的是（ ）

A．船底镶嵌锌块，锌作负极，以防船体被腐蚀

B．锌表面镀铜，锌作阳极

C．工业上电解饱和食盐水的阳极反应：

D．氢氧燃料电池（碱性）的正极反应是：
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单项选择题

The similarity between ichthyosaurs and fish is an example of convergence, a process by which different classes of organisms adapt to the same environment by independently developing one or more similar external body features. Ichthyosaurs were marine reptiles and thus do not belong to the same class of organisms as fish. However, ichthyosaurs adapted to their marine environment by converging on external body features similar to those of fish. Most strikingly ichthyosaurs, like fish, had fins.
If the statements above are true, which one of the following is an inference that can be properly drawn on the basis of them

A．The members of a single class of organisms that inhabit the same environment must be identical in all their external body features.

B．The members of a singly class of organisms must exhibit one or more similar external body features that differentiate that class from all other classes of organisms.

C．It is only as a result of adaptation to similar environments that one class of organisms develops external body features similar to those of another class of organisms.

D．An organism does not necessarily belong to a class simply because the organism has one or more external body features similar to those of members of that class.

E．(E) Whenever two classes of organisms share the same environment, members of one class will differ from members of the other class in several external body features.
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