What can you conclude（下结论）from this passage?
What's the author's attitude（态度）towards...?
We can infer from the passage that。。。
Which statement is ( not ) true?
once there was something wrong with a machine in a factory. The workers could do nothing but turn to a German engineer for help, who drew a line on it and said, "Take off the part where the line is and change it for a new one."The machine, with a new line on, began running well again. The engineer then asked for $ 30,000 for what he had done. The following were what he wrote on a bill, "The new part only costs one dollar, and knowing where the problem with the machine is costs $ 29,999."
（ ）What can you conclude from this passage?
A. the engineer asked for too much money
B. the workers should pay the money
C. the knowledge is worth money
D。 the new part could cost more