You can have second try if you fail this time. A．/ B．an C．the D．a
将调查到的生物分为植物、动物、其他生物三大类的依据是（ ） A.用途 B.生活环境 C.形态结构 D.个人喜好
一铅球运动员，奋力一推将8 kg的铅球推出10 m远.铅球落地后将地面击出一坑，有经验的专家根据坑的深度形状认为铅球落地的速度大致是12 m/s.若铅球出
不能鉴别乙酸溶液、乙醇溶液的试剂是 （ ） A.氢氧化钠溶液 B.氢氧化铜悬浊液 C.石蕊试液 D.碳酸钠溶液
流行性感冒的传染源是( )A.流感患者 B.空气和飞沫 C.老人和小孩 D.流感病毒
首都国庆群众游行时，当海南彩车“绿色海南”从天安门前经过时，彩车底部蓝色海浪翻滚，海洋景观栩栩如生，海底生物惟妙惟肖，其最大特点就是
One day, a poor boy who was trying to pay his way through school by sending newspapers door to door, was so hungry that he decided to beg for a meal at the next house. However, he lost his nerve (胆
