通读下面的短文，掌握其大意。然后，从每小题的四个选项中选出可填入相应空白处的最佳选项。
One of the most remarkable things about the human mind is our ability to imagine the future. In our minds we can see what has not yet happened. For example, while we are looking forward to 21 a new place or country, we 22 what it will be like. We predict（预料）the way people will eat, dress and act. Of course, we do not always predict things 23 . Things are often very different from the way we 24 them to be.
One of the most 25 dreams in history is the dream of the German scientist, Kekule, who had been 26 to work out a very difficult problem in Physics. He had 27 and analyzed（分析）the problem from every angle（角度）for days, but there seemed to be no way of 28 out he answer. Then one might go to bed and dream. When he 29 up, he realized that he knew the answer. He had solved the problem in his 30 .
The hypnotist（催眠者）sat in the chair opposite him and spoke 31 : I want you to concentrate on my voice. Think about 32 . You know nothing but my voice. And as you pay attention to my voice, your 33 will get heavier. Soon you'll be asleep.
You will hear my voice and understand my words, but your body will be asleep, because your eyes are too heavy. You are 34 asleep, and when you wake up you will remember nothing.
You will forget everything. Now I am going to 35 slowly from one to five. One, two, three, four, five.
____
本句句意为：在去之前，我们会想像它是个什么样的。B draw画，一般是draw pictures; C seem似乎，好像，D put forward提出，只有A表示想像。
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_______。
