Have you ever argued with your loved ones over simple misunderstandings （误解）? Little wonder. We often believe we're more skillful in getting our point across than we actually are, according to Boza Keysar, a professor at the University of Chicago. In his recent study, speakers tried to express their meanings using unclear sentences. Speakers who thought listeners understood were wrong nearly half the time. Here's some good advice to reduce misunderstanding: (1) Don't trust what you see from the listener. Listeners often nod, look at you or say “uhhuh” to be polite or move the conversation along. But it's easy to consider these as signs of understanding. (2) Train the editor（编辑）in your head. If you say, "Beth discusses her problems with her husband, "it's not clear whether she's talking to her husband or about him. Try instead, "Beth talks to her husband about her problems." Or "Beth talks to others about the problems with her husband." (3) Ask listeners to repeat your message. Introduce your request by saying "I want to be sure I said that right." Questions like “How does that sound?" or "Does that make sense?" may also work.(4) Listen well. When on the receiving end, ask questions to be sure you're on the same page. After all, it isn't just the speaker's job to make his speech understood．
The writer suggests that when talking to others, the speaker should ____.（ ）
根据建议的第一条，不要太相信你所看到的，有时听者点头只是为了让对话顺利进行下去，所以说者要努力表达清楚自己，故选B。
把10gMgCl2和MgSO4的混合物溶于适量水中，滴加2mol／L的BaCl2溶液至沉淀完全，共消耗BaCl2溶液25mL。求混合物中MgCl2和MgSO4的质量各是多少克
固定在匀强磁场中的正方形导线框abcd，各边长为1．其中ab是一段电阻为R的均匀电阻丝，其余3边均为电阻可忽略的铜线。磁场的磁感应强度为B，方向垂直纸面向里。现有一与ab段的材料、粗细、长度都相同的电阻丝PQ架在导体框上，如图所示。PQ以恒定速度方向如何
一小物块以速度v0=10m／s沿光滑地面滑行，然后沿光滑曲面上升到顶部水平的高台上，并由高台上飞出，如图所示。问当高台的高度h多大时，小物块飞行的水平距离最大这个距离是多少(g=10m／s2)
某晶体盐的水溶液呈浅绿色，在此溶液中通入氯气，溶液变为棕黄色，把所得棕黄色溶液分成两份：一份加入KSCN溶液，溶液变深红色；另一份加入BaCl2溶液，产生不溶于稀HNO3的白色沉淀，则该晶体盐的化学式是_______。
欲除去乙烷中的乙烯，可将混合气体通过盛有_______的洗气瓶；欲除去乙炔中的硫化氢，可将混合气体通过盛有_______的洗气瓶。
浓硝酸常盛装在棕色瓶中，且贮放在冷暗处，原因是_______，
碳酸氢钠溶液和烧碱溶液反应的离子方程式为_______。
常温下，氨水中存在的离子有_______。
在酸或碱存在的条件下，甲酸甲酯跟水发生水解反应的化学方程式为_______。
有下列几种气体：H2、O2、HCl、NO、NH3、CH4，其中通常情况下能用来和水做“喷泉”实验的是_______。
