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最佳选项。
I have been hearing-impaired in my life since I was five years old. Putting on hearing aids in the morning has been just as 21 as brushing my teeth. However I never believed that it should limit my 22 in my way.
During my 17 years I have met many people who don’t know about 23 disabilities and deal with 24 by stereotyping me. My teacher would not let me sit past the second row because they 25 I would not be able to hear. People tend to speak 26 than normal when they see. my thick plastic hearing aids in my ears. However, my hearing disability has made me a stronger person. Because I wear heating aids I have to prove that I am not 27 or mentally limited. I have to work harder and earn top grades in school to earn the 28 of my teachers. In shorts, I've had to run faster, catch better and score more points to prove I am not physically 29 .
I don't fit in with people who are deaf and 30 as a way to communicate. I consider myself no difference from anyone else. And I am not "half deaf" with my hearing aids 31 ; I can hear just as well as anyone else.
In my struggle to prove I am 32 to my non-disabled I have made myself better than the average teenager. I won the all-star 33 on my softball team. I have made myself a 34 through my published poetry and articles.
Instead of giving up, I have proven that I can do anything I want. I truly believe I would not be the 35 person I am today if I did not have a hearing disability.
____.
通读全文，可以看出作者在学校取得了出色的成绩。
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_______。
