早期发现直肠癌最重要的检查方法是

A. 直肠指检
B. 内窥镜检查
C. X线钡剂灌肠
D. 便常规检查

直肠癌的早期症状是

A. 骶尾部剧痛
B. 排便变细
C. 便血
D. 体重减轻

用统计指标对定量资料进行统计描述时，反应离散趋势的有：（）

A. 算数均数
B. 中位数
C. 众数
D. 几何平均数
E. 标准差

tiger butterflies chicken elephanthorses snail fish1. At a __________'s speed.-------------- slow

tiger butterflies chicken elephanthorses snail fish2. Big _______in a small pond. -------famous people in a small town

tiger butterflies chicken elephanthorses snail fish3. __________feed. --------------small benefit

tiger butterflies chicken elephanthorses snail fish4. Get the ______by the tail.--------------dealing with a very tough job

tiger butterflies chicken elephanthorses snail fish5. Have _________in one’s stomach. -------------- being nervous

tiger butterflies chicken elephanthorses snail fish6. On their high ___________.--------------being proud

tiger butterflies chicken elephanthorses snail fish7. White __________.-------------- something useless, liability, burden