假如地球的引力减小一半，那么对于漂浮在水面上的某艘船来说，它所受的重力和吃水深度(吃水深度指水面到船底的深度)与原来相比，下列说法正确的是  (       )

材料一：《人民的名义》剧中光明区信访局的低矮窗口让人印象深刻。而现实中郑州等多地蹲式窗口相继被网友曝光，反映了“过于低矮，让人站也不是，蹲也不是”的问题。

材料二：《人民的名义》倒逼多地现实版“蹲式窗口”整改，被网友曝光的涉事部门大都承认错误，及时整改，或拆除围挡，或增加座椅，尽可能方便群众办理业务。

材料三：

增加：在缺词处加一个漏字符号（∧），并在其下面写出该加的词。

删除：把多余的词用斜线（\）划掉。

修改：在错的词下划一横线，并在该词下面写出修改后的词。

注意：1）每处错误及其修改均仅限一词；

2）只允许修改10处，多者（从第11处起）不计分。

    As we all know, we can meet with various challenges in our life. Faced with challenges, how should we do?

    Last month, our class climbed Mount Tai, that is more than 1,500 meters above sea level. Lacking exercise, I thought that this activity was great challenge for me. I felt very exhausted halfway that I wanted to give up. See this, my classmates and even some strangers encourage me. By the end, I managed to reach on the top of the mountain.

    Therefore, don't give up in face of challenges. If you are determined enough, it's certainly that you can overcome it.

图中，①代表氧气，②代表二氧化碳，（一）、（二）分别表示植物不同的生命活动过程，请据图分析回答下列问题：