So far, so good. This is not rocket science. Defensive pessimists prepare carefully and consider what might go wrong, whether at work, on a date or even in a sports game. It makes sense to have a back-up plan. There are many sayings in English urging caution. For example, “Don't put all your eggs in one basket," and “ Don't count your chickens until they hatch. “ To have a confident and optimistic approach to life's problems is good. But listen to what Woody Alien ，the American comedian says, ”Confidence is what you have before you understand the problem.“

　　There are pros and cons to being an optimist and a pessimist. Don't feel bad if you see the glass half empty. You are a realist. But lighten up and hook up with someone who sees the same glass half full.

　　What is the passage mainly about?

　　A. A book that has recently been published.

　　B. The dangers of being too optimistic.

　　C. The benefits of defensive pessimism.

　　D. How to become successful in life.

　　The underlined sentence “This is not rocket science" in paragraph 4 means_____.

　　   A. the cost is not so high                       B. there is no real proof

　　C. it's not a dangerous thing to do      

　　D. it is quite simple to understand

　　The writer would probably describe himself as_____.

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