The paintings that David donated to the school in the exhibition room these days. A. are being shown B. are showing C. are being showing D. are sh
臭氧可使湿润的淀粉碘化钾试纸变蓝，化学方程式为KI+O3+H2O→KOH+I2+O2（未配平），下列叙述正确的是 （）。A.在反应中H2O被氧化成O2 B.该反应的还原产物
74. --- Have you ever read that article? --- Yes, But I think there is nothing _______ in it. Which of the following is wrong? difficulty B. new
仔细阅读下面问题的解法：设A=［0，1］，若不等式21-x+a＞0在A上有解，求实数a的取值范围. 解;令f(x)=21-x+a,∵f(x)＞0在A上有解，∴f(x)在A上的最大值大于0.
下列对引起巴黎公社革命的原因的表述中最确切的一项是（ ） A．第三帝国的反动统治 B．资产阶级对无产阶级的残酷剥削和
2009年2月26日，北京市十三届人大常委会召开第三十次主任会议，会议指出，要按照坚持党的领导、人民当家作主和依法治国有机统一的要求，以促进居
阅读理解Online shopping is very popular among most Internet users. Almost 85% of Internet users in the US like to shop online. In Korea, 99% of the Internet users say they regularly shop online.In
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