The detectors, sold for up to $42,000 each, were said to be able to find such dangerous objects as bombs under water and from the air. But in fact they "lacked any grounding in science" and were of no use. McCormick had told the court that he sold his detectors to the police in Kenya, the prison service in Hong Kong, the army in Egypt and the border control in Thailand.

　　"I never had any bad results from customers," he said.

　　48. Why was McCormick sentenced to prison?

　　A. He sold bombs.

　　B. He caused death of people.

　　C. He made detectors.

　　D. He cheated in business.

　　49. According to the judge, what McCormick had done _______.

　　A. increased the cost of safeguarding

　　B. lowered people's guard against danger

　　C. changed people's idea of social security

　　D. caused innocent people to commit crimes

　　50. Which of the following is true of the detectors?

　　A. They have not been sold to Africa.

　　B. They have caused many serious problems.

　　C. They can find dangerous objects in water.

　　D. They don't function on the basis of science.

　　51. It can be inferred from the passage that McCormick _______.

　　A. sold the equipment at a low price

　　B. was well-known in most countries

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