单选题According to the passage, the scientists carried out their researches on ______.A smokers from different parts of the worldB smokers from different states in the United StatesC actors and actresses who smoke a lotD wait staff and bartenders
题目
单选题
According to the passage, the scientists carried out their researches on ______.
A
smokers from different parts of the world
B
smokers from different states in the United States
C
actors and actresses who smoke a lot
D
wait staff and bartenders
相似考题
参考答案和解析
正确答案：
C
解析：
推断题。答案来自第一段最后：…nonsmokers working in bars and restaurants in the state.由此可知其实验对象为酒吧与餐厅的侍者，答案为D。
推断题。答案来自第一段最后：…nonsmokers working in bars and restaurants in the state.由此可知其实验对象为酒吧与餐厅的侍者，答案为D。