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Thinking is something you choose to do as a fish chooses to live in water. To be human is to think. But thinking may come naturally without your knowing how you do it. Thinking about thinking is the key to critical thinking. When you think critically, you take control of your thinking processes. Otherwise, you might be controlled by the ideas of others. Indeed, critical thinking is at the heart of education.
The word “critical” here has a special meaning. It does not mean taking one view against another view, as when someone criticizes another person for doing something wrong. The nature of critical thinking is thinking beyond the easily seen — beyond the picture on TV, the untrue reports in the newspapers, and the faulty reasoning.
Critical thinking is an attitude as much as an activity. If you are curious about life and desire to dig deeper into it, you are a critical thinker. If you find pleasure in deep thinking about different ideas, characters, and facts, you are a critical thinker.
Activities of the mind and higher-order reasoning are processes of deep and careful thinking. They take time, and do not go hand in hand with the fast speed in today’s world: fast food, instant coffee, and self-developing film. If you are among the people who believe that speed is a measure of intelligence, you may learn something new from a story about Albert Einstein. The first time Banesh Hoffman, a scientist, was to discuss his work with Albert Einstein, he was too nervous to speak. But Einstein immediately put Hoffman at ease by saying, “Please go slowly, I don't understand things quickly.”
69. According to the passage, if we don’t think critically, we ___________.
A. may not be able think naturally 
B. will be controlled by ideas of other people
C. can control the ideas of others    
D. might be fooled by other people
70.  A critical thinker will ___________.
A. think deeply about different ideas              B. trust the reports in the newspapers
C. take one view against another view            D. criticize other people for their mistakes
71. What would be the best title for the passage?
A. The heart of education                     B. Understanding critical thinking
C. Thinking fast                            D. Thinking and intelligence