霍乱确诊依据是
A．接触史
B．典型临床表现
C．排除食物中毒，菌痢等其他疾病
D．脱水，血液浓缩
E．便培养阳性
参考答案：E
如图，△ABC的内部有一点P，且D，E，F是P分别以AB，BC，AC为对称轴的对称点，若△ABC的内角∠A=70°，∠B=60°，∠C=50°，则∠ADB+∠BEC+∠CFA=
A、180°
B、270°
C、360°
D、480°
— You look upset. What's the matter?
— I had my proposal _____ again. [ ]
A. turned over
B. turned on
C. turned off
D. turned down
