题目

My car and my best friend     For most, getting your first car opens up a new world of freedom and allows you to go wherever you want, whenever you want. Getting a car did   36   this for me, and it also brought my best friend and me  37  . But then it tore us apart (分开).    My best friend lives three minutes from my   38  . Since her  39   is in late summer, seven months behind mine, I basically became her   40   when I turned 16 in December.    And so I   41   her up for school and took her home. We made ice-cream   42  , went shopping and to the mo燃料电池是目前正在探索的一种新型电池．它主要是利用燃料在燃烧过程中把化学能直接转化为电能，目前已经使用的氢氧燃料电池的基本反应是：x极：O2（气）+2H2O（液）+4e-=4OH-y极：H2（气）+2OH--2e-=2H2O（液）回答下列问题：（1）x是 极，发生 反应．（填“氧化”或“还原”，下同）（2）y是 极，发生 反应．总反应方程式为 ．（3）若反应后得到5.4g液态水，此时氢氧燃料电池转移的电子数为 ．