A:该实验在黑暗中进行,可排除受光不均匀对实验结果的影响
B:该实验证明尖端确实能产生某种物质,该物质是生长素
C:对照组是没有尖端的胚芽鞘,不生长
D:该实验证明了生长素在植物体内进行极性运输
计算a2b•a的结果是( )
根据汉语提示,完成句子 Good eating____(习惯) are very important. Healthy lifestyle helps me get good____ (成绩). He is____(躺)in bed to read a book.
I will____ (寄) Tom a postcard. If you are____(口渴的), you may have an apple.