问题
单项选择题
病例对照研究中，在调查既往的暴露史时易发生（）
A．入院率偏倚
B．存活病例偏倚
C．回忆偏倚
D．无应答偏倚
E．失访偏倚
答案
参考答案：C
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病例对照研究中，在调查既往的暴露史时易发生（）
A．入院率偏倚
B．存活病例偏倚
C．回忆偏倚
D．无应答偏倚
E．失访偏倚
参考答案：C
完形填空。 Tony is four years old. His (1) name is Brown. (2) father and mother (3) doctors .They are very busy and Tony is (4) home alone . Tony likes drawing very much. He often draws dogs, cocks, foxes and flowers (5) the floor or on the wall. One afternoon, Tony’s mother buys brushes and many books for (6). Tony is very happy. After supper his (7) watch TV, but he begins to draw carefully at the table. “ (8) do you draw , Tony ?” asks his father . “God(上帝) ,” the (9) answers. “But we can’t (10) God and what does God look like?” “When I finish drawing, you will know about it,” says the little boy .
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