We came early and had to wait two hours before the ceremony began. We_______.
A. should not hurry
B. must not have hurried
C. need not hurry
D. need not have hurried
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"Have you paid your telephone bill?""No, but I________yesterday."
A. ought to pay it
B. ought to have paid it
C. must pay it
D. must have paid it
He__________pull down a bull and acknowledged as a man with superman strength.
A. used to be able to
B. would be able to
C. should be able to
D. might be able to
研究糖尿病病人的自我护理能力,组成该总体的糖尿病患者为
A. 有限总体
B. 无限总体
C. 样本
D. 层
E. 区组
某研究者欲调查急诊护士的工作压力,选取本院急诊科全体护士为研究对象,这种抽样方法为
A. 方便抽样
B. 整群抽样
C. 系统抽样
D. 随机抽样
E. 目的抽样