钼缺乏患者的非特异性临床表现为（）
A.昏迷
B.心动过速
C.呼吸急促
D.夜盲
E.以上全是
参考答案：E
—Where is Sally?
—I don't know. I _____ her here a moment ago. [ ]
A. see
B. saw
C. will see
D. have seen
预测的实践基础是 ( )
A．系统分析
B．回归分析
C．调查研究
D．历史类比
