问题 单项选择题 A1型题

降低泪膜表面张力的是()。

A.脂质层

B.黏蛋白层

C.水液层

D.细胞因子

E.营养因子

答案

参考答案:B

解析:黏蛋白层基底部分嵌入角结膜上皮细胞的微绒毛之间,降低表面张力,使疏水的上皮细胞变为亲水。

下面三幅图都与美国的历史有关,仔细观察三幅图片回答问题:

请回答:

(1)图(1)反映的是哪个时期的美国?

                                                                                                                                                          

(2)图(2)中自由女神的右手高举着火炬,左手拿着一本书,这本书内容的颁布宣告了美国的独立。

    请问这本书的名称的是什么? 为什么马克思称之为“第一个 * * 宣言”?

                                                                                                                                                         

                                                                                                                                                         

                                                                                                                                                         

(3)图(3)是什么?它与图(1)有什么联系?

                                                                                                                                                         

                                                                                                                                                         

(4)被称为美国的“开国元勋”的是谁?他的主要贡献有哪些?

                                                                                                                                                         

                                                                                                                                                         

(5)“忘记历史就意味着背叛。”就图(2)和图(3)所反映的内容谈谈自己的看法。

                                                                                                                                                         

                                                                                                                                                         

单项选择题