下列现象中，属于特异性免疫的是（　　）

下图装置（Ⅰ）是一种可充电电池，装置（Ⅱ）为电解池。

装置（Ⅰ）的离子交换膜只允许Na⁺通过，已知电池充放电的化学方程式为2Na₂S₂+NaBr₃Na₂S₄+3NaBr。当闭合开关K时，X电极附近溶液变红。下列说法正确的是（      ）

阅读下面材料，在空白处填入适当的内容（一个单词）或括号内单词的正确形式。答案写在答题卷上。
    Are you facing a situation that looks impossible to fix?
    In 1969, the pollution was terrible along the Cuyahoga River near Cleveland, Ohio. It ____ (be) unimaginable that it could ever be cleaned up. The river was so polluted that it ____ (actual) caught fire and burned. Now, years later, this river is one of ____ most outstanding examples of environmental cleanup.
    But the river wasn't changed in a few days ____ even a few months. It took years of work ____ (reduce) the industrial pollution and clean the water . Finally, that hard work paid off and now the water in the river is ____ (clean) than ever.
    Maybe you are facing an impossible situation. Maybe you have a habit ____ is driving your family crazy. Possibly you drink too much or don't know how to control your credit card( 信用卡) use. When you face such an impossible situation, don't you want a quick fix and something to change immediately?
    While there are ____ (amaze) stories of instant transformation(转变)，for most of us the ____ (change) are gradual and require a lot of effort and work, like cleaning up a polluted river. Just be ____ (patience)

下列有关说法正确的是（   ）

《离骚》中表明作者在黑暗混乱社会中烦闷失意，走投无路的两句：____，____。