题目

One of the easiest things in the world is to become a fault-finder. However, life can be _____ when you are not busy finding fault with it.Several years ago I ___ a letter from seventeen-year-old Kerry, who described herself as a world-class fault-finder, almost always ___ by things. People were always doing things that annoyed her, and ___ was ever good enough. She was highly self-critical and also found fault with her friends. She became a really ___ person.Unfortunately, it took a horrible accident to change her ___. Her best friend was seriously hurt in a car crash. What made it almost ___有反应：8A＋3B2＝C2＋6D（其中A、D是化合物，B2、C2是单质）．若13.6g A与21.3g B2恰好完全反应，生成32.1g D，已知C2的相对分子质量为28，则B的相对原子质量为A．14           B．16          C．32          D．35.5