物理学中一个基本观点是“世界是由物质组成的。
成都所属的干湿地区是( )
我国面积最大的省级行政单位是( )
科学考察工作者为了测海底某处的深度,从海面向海底垂直发射超声波,经过0.6s收到回波信号,则该处海水深度是(声音在海水中传播的速度约1500m/s)( )
Hello. I am Amy. I am eight years old. Today is my birthday. Look, I have a birthday cake. I have juice and rice for dinner. And I have many gifts, too. A red toy monkey, two new bags and five storybooks. I am so happy today.