D
Life is difficult.
It is a great truth because once we truly understand and accept it, then life is no longer difficult.
Most do not fully see this truth. Instead they complain about their problems and difficulties as if life should be easy. It seems to them that difficulties stand for a special kind of suffering especially forced on them or else on their families, their class, or even their nation.
What makes life difficult is that the process of facing and solving problems is a painful one. Problems, depending on their nature, cause sadness, or loneliness or regret or anger or fear.
These are uncomfortable feelings, often as painful as any kind of physical pain. And since life causes a lot of problems, life is always difficult and is full of pain as well as joy.
Yet, it is in this whole process of solving problems that life has its meaning. Problems are the serious test that tells us success from failure. When we want to encourage the growth of human spirit, we encourage the human ability to solve problems, just as in school we set problems for our children to solve. It is through the pain of meeting and working out problems that we learn. As Benjamin Franklin said, “Those things that hurt, instruct(指导).” It is for this reason that wise people learn not to fear but to welcome the pain of problems.
小题1:Which sentence best express the central point of the passage?
A．Problems and difficulties represent a special kind of suffering.
B．We become stronger by facing and solving problems of life.
C．Life is difficult because our problems bring us pain.
D．People like to complain about their problems.小题2:The writer probably used just one short sentence in the first paragraph to ___.
A．save space
B．persuade readers
C．make readers laugh
D．get readers’ attention小题3:The main idea of paragraph 3 is that _________.
A．most people feel life is easy
B．the writer feel life is easy
C．the writer likes to complain about his problems
D．most people complain about how hard their lives are小题4:According to the passage, we give school children difficult problems to solve in order to ______.
A．encourage them to learn
B．teach them to fear the pain of solving the problems
C．help them learn to deal with pain
D．teach them how to respect problems小题5:The saying from Benjamin Franklin “Those things that hurt, instruct” suggests that ______.
A．we do not learn from experience
B．we do not learn when we are in pain
C．pain teaches us important lessons
D．pain cannot be avoided
。该电池正极的电极反应式为___________________________。