What, according to the passage, makes the research conducted by the scientists at the Oregon Department of Health so unique?
A、The fact that the scientists managed to measure the average hourly increase of NNK.
B、The fact that the scientists succeeded in making more people realize the harm of smoking.
C、The fact that the scientists did a lot of experiments on smokers in public areas.
D、The fact that the scientists discovered NNK, a carcinogen in cigarette smoke.
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试题解析
细节理解题。答案来自第三段:“We were somewhat surprised by the immediacy of the effect and the fact that we could measure the average hourly increase.”