最易引起病毒性心肌炎的病毒是（）
A.柯萨奇病毒A组
B.柯萨奇病毒B组
C.艾柯病毒
D.脊髓灰质炎病毒
E.肠道病毒70型
参考答案：B
如果采用的高血压患者都是患病时间较长的患者，可能造成的偏倚是
A．报告偏倚
B．现患病例—新发病例偏倚
C．测量偏倚
D．失访偏倚
E．检出症候偏倚
Barack Obama told millions ______ him that his grandmother's influence on ______ he is and the way he views the world was significant.
A．watch; how
B．watching; who
C．watched; where
D．to watch; what
