自然观察是在限定条件下进行的观察，被观察者可能知道，也可能不知道自己正处于被观察的地位。（）
参考答案：错
解析：将“自然观察”改为“控制观察”
Man: Would you like to have some icecream I’ve got a variety of flavors. Woman: I wish I could, but I just can’t. I’m on a diet. Question: What do we learn about the woman
A. She is difficult to please.B. She is particular about flavor.C. She is trying to lose weight.D. She is crazy about icecream.
男，35岁。血压28/16kPa(210/120mmHg)，心界向左下扩大，血红蛋白45g/L，尿蛋白(+++)，红细胞5/HP～10/HP，血Cr560μmol/L，B超双肾缩小，眼底有出血渗出。该病人贫血的原因不包括
A．促红细胞生成素减少
B．红细胞寿命缩短
C．造血原料不足
D．电解质紊乱
E．红细胞成熟障碍
