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 the volunteers tested negative during screening
40. In the eyes of the researchers the percentages given in the last paragraph ________.
A. are somewhat inaccurate
B. are pretty small
C. are rather high
D. are quite unbelievable
第三篇
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