50. D【解题思路】参见上题解析。

　　完形填空-----B

　　People do not analyze every problem they meet. Sometimes they try to remember a solution, from the last time they had a

　　1

　　problem. They often accept the opinions or ideas of other people. Other times they begin to act without

　　2

　　, they try to find a solution by trial or error.

　　3

　　, when all of these methods

　　4

　　, the person with a problem has to start analyzing. There are six

　　5

　　in analyzing a problem.

　　6

　　the person must recognize that these is a problem. For example, Sam's bicycle is broken, and he cannot ride it to class as he usually does. Sam must

　　7

　　that there is a problem with the bicycle.

　　Next, the person must find the problem. Before Sam can repair his bicycle, he must know why it does not work. For example, he must

　　8

　　the parts that are wrong.

　　Now the person must look for

　　9

　　that will make the problem clearer and lead to

　　10 solutions. For example, suppose Sam decides that his bicycle does not work because there is something wrong with the brakes.

　　11

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