49. The word “enhancing” in the first sentence of the second paragraph means “_____”。

　　A. showing

　　B. directing

　　C. upsetting

　　D. improving

　　50. What can we know from the third paragraph?

　　A. Blood doping is transferring one man’s blood into another

　　B. Only blood doping exists in the anti-doping war in the 1970s.

　　C. Blood doping is easy to be found and controlled by organizations.

　　D. More oxygen in the blood helps improve an athlete’s performance.

　　51. The word “people” in the second sentence of the fourth paragraph probably refers to _____.

　　A. teachers who teach P.E. lessons at school

　　B. experts who do research in doping

　　C. young people easy to be addicted to doping

　　D. athletes involved in doping

　　52. Which statement best matches the last paragraph?

　　A. Prevention is better than cure.

　　B. Reading is to the mind what exercise is to the body.

　　C. The best horse needs breaking, and the cleverest child needs teaching.

　　D. A little learning is a dangerous thing.

　　D

　　About 12,000 years ago- long before the famous UFO crash make headlines in America—an alien spaceship crashed in China. And their descendants are still living in a faraway Chinese village today! That is the mind-bending claim made in the new book Out of Time and Place, a collection of reports from the files of Fate, a magazine edited by Terry O’Neil.

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