第17题: [单项选择]Medical experts believe that the high______ of heart disease and high blood pressure is related to over abundance of cholesterol(胆固醇) in American diet. A. circulation B. disturbance C. incidence D. suspension 参考答案:C 答案解析:题意是:医学专家认为心脏病和高血压的高______与美国人饮食中过量的胆固醇有关。 [C]incidence“发生率”,符合题意。 [A]circulation“传播,流通”,[B] distur