下图是钠与氯气（Cl₂）反应生成氯化钠的模拟图。从图示可知下列说法不正确的是（ ）

如图所示，光滑的水平桌面上放着两个完全相同的金属环a和b，当一条形磁铁的S极竖直向下迅速靠近两环中间时，则（   ）

尊重是一种修养，一种品格，一种对别人平等的态度，一种对他人人格与价值的充分肯定。在下列情境中，你该怎么做？请用一两句话做出回答。

阅读下面的文本, 从A、B、C、D四个选项中选出最佳选项。

    My friend Bob has a large police dog named Jack. Every Sunday afternoon, Bob and Jack have a walk in the park near their home. Jack likes these walks very much.

    On a cold Sunday afternoon, I go to Bob's home. Bob is happy to see me. At first Jack is happy too. Bob and I talk for a long time. Jack plays with a ball in the room for some time. Then he sits down in front of me and looks at me. I go on talking with Bob. Just at that time, Jack takes my hat and runs out of the room. I go after him to get my hat back. Suddenly, I know what Jack wants to do.

What a clever dog!