Volunteers who had nodules over 9.7 mm in width, or had growth of 4.6 mm that grew fast enough to more than double in volume every 400 days, were sent for further testing. Of the 196 people who fell into that category, 70 were found to have lung cancer，10 additional cases were found years later.

　　But of the 7, 361 who tested negative during screening only 20 lung cancer cases later developed.

　　In a second round of screening done one year after the first, 1.8 percent were sent to the doctor because they had a nodule that was large or fast-growing. More than half turned out to have lung cancer.

　　The result means that if the screening test says you don't have lung cancer, you probably don't,the researcher said. "The chances of finding lung cancer one and two years after a negative first-round test were l in l,000 and 3 in l,000 respectively, " they concluded.

　　36. The new study indicates that in case of small or slow-growing lung nodules_________.

　　A. you cannot be too careful

　　B. cancer is just matter of time

　　C. a biopsy is unnecessary

　　D. more aggressive testing is a must

　　37. Which is probably NOT true of lung cancer?

　　A. Smokers are usually considered to be at high risk for it.

　　B. It is the leading cause of cancer deaths around the world.

　　C. 159,000 new cases of it are diagnosed in the US each year.

　　D. It often goes unnoticed until it has spread.

　　38. According to the passage, good guidelines for lung cancer screening ________.

　　A. are a little bit too costly

　　B. do not exist yet

　　C. are being implemented

　　D. have been developed

　　39. All the following statements are true EXCEPT________.

　　A. a relatively small number of the volunteers had large or fast-growing nodules

　　B. almost all those with large or fast-growing nodules were found to have lung cancer

　　C. all the volunteers were at high risk for lung cancer

　　D. most of