写作 2015年9月29日是扬州建城2500年城庆日，作为扬州市民的你应该为这场盛会中作出哪些贡献呢？ 美化环境不乱扔垃圾，保持公共场所干净整洁； 植
Sarah, it is high time that you_______; or you won’t have time to______ before the party. A. got up; get changed B. get up; get changed C. will get up; get changing
Carrie is _____ her dictionary. Has anyone seen it? A. getting out B. taking on C. referring to D. looking for
如图所示，从光滑的1/4圆弧槽的最高点滑下的小滑块，滑出槽口时速度方向为水平方向，槽口与一个半球顶点相切，半球底面为水平，若要使小物块滑
在密闭容器中加入甲、乙、丙、丁四种物质，在一定条件下发生化学反应，测得反应前及t1、t2时各物质质量变化情况如图所示，下列说法正确的是（
下列物质中主要成分不是二氧化硅的是 A．玛瑙 B．水晶 C． 硅胶 D
The company was the first ____ portable radios as well as cassette tape recorders .A. producing B. to produce C. produced D. having produ
