类风湿性关节炎的晚期表现为
A．关节间隙变窄或骨性强直B．边缘性骨侵蚀C．关节变形D．关节脱位或半脱位E．以上都是
参考答案：E
能证明分子在化学反应中可以再分的变化是（ ）
A．碘受热变成碘蒸气
B．一定条件下二氧化碳制干冰
C．铁块研磨成铁粉
D．碳酸氢钠受热放出二氧化碳
Ten years ago, the population of our village was________that of theirs.[ ]
A. as twice large as
B. twice as large as
C. twice as much as
D. as twice much as
