某医师欲采用横断面调查研究的方法,调查高血压病在人群中的分布情况,选择最合适的指标为
A.病死率B.发病率C.死亡率D.患病率E.二代发病率
参考答案:B
In the beginning,the man refused to say anything about the lost car,but he had to admit ________ it because of the solid proofs.
A.stolen
B.stealing
C.to steal
D.to have stolen
西双版纳马戏团正在“江海风情园”演出,大象们列队进场,大象的脚比它们的鼻子和尾巴的总和还多10.场内共有( )只大象.
A.5
B.10
C.15
D.20