正确答案: B

承揽合同

题目：顾客将胶卷照相馆冲印，照相馆交给顾客一份取印单，该取印单属于（）。

解析：B

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学习资料的答案和解析：

[单选题]下述符合慢性支气管炎病变的是

鳞状上皮化生

解析：

48．答案：A

[考点] 慢性支气管炎

[分析] 慢性支气管炎病变包括支气管粘膜上皮变性坏死，腺体肥大、分泌亢进，软骨变性、钙化，慢性炎细胞浸润，鳞状上皮化生。肉芽肿形成、瘢痕形成、异物巨细胞形成、软骨增生均不属于慢性支气管炎病变。

[单选题]Which of the following statements can best be inferred from the passage?

Researches are now being made to study the significance of fish sounds.

解析：答案为 B。根据第一段第二至第五句， Actually， their talk may be as meaningful as much of our own．For example，some sea animals use their  "voices" to locate their food in the ocean expanses；others use their "voices" to let their fellows know of their locations；and still others，as a means of obtaining mates．Sometimes, "speaking" may even mean the difference between life and death to a sea animal．It appears in some cases that when a predator approaches，the prey depends on no more than the sounds it makes to escape 作出该项选择。选项 A中only不确切；选择 C和D在文中都没提到。