氢氧化钠是重要的化工原料，其俗称是(    )

读《魏公叔痤病》一文，完成小题。
        魏公叔痤①病，惠王往问之。曰：“公叔病，即不可讳②，将奈社稷何?”公叔痤对曰：“痤有御庶子公孙鞅③，愿王以国事听之也。为④弗能听，勿使出竞⑤。”王弗应，出而谓左右曰：“岂不悲哉!以公叔之贤，而谓寡人必以国事听鞅，不亦悖⑥乎!”
        公叔痤死，公孙鞅闻之，已葬，西之秦，孝公受而用之。秦果日以强，魏日以削。此非公叔之悖也，惠王之悖也。悖者之患，固⑦以不悖者为悖。
【注】①公叔痤(cu6)：魏相。②即：如果。不可讳：意为不幸去世。③御庶子：家臣。公孙鞅：即商鞅。④为：如果。⑤竞：同“境”。⑥悖：糊涂、昏聩。⑦固：原来。

①How many children are there? ____            A. It's forty yuan.

②What are they doing? ____                          B. Playing basketball.

③How much is the basketball? ____               C. Every afternoon.

④How often do they play basketball?____     D. Tired and exhausted.

⑤How do they feel now? ____                        E. There are nine.

⑥Where do they play basketball? ____           F. In the gym.