问题
单项选择题
侧芽部位的生长素浓度总是高于顶芽,但是顶芽产生的生长素仍大量积于侧芽部位,这是因为生长素的运输方式属于()
A.自由扩散
B.主动运输
C.协助扩散
D.极性运输
答案
参考答案:B
侧芽部位的生长素浓度总是高于顶芽,但是顶芽产生的生长素仍大量积于侧芽部位,这是因为生长素的运输方式属于()
A.自由扩散
B.主动运输
C.协助扩散
D.极性运输
参考答案:B
从II栏中找出与I 栏相对应的答语 |
I 1. Good afternoon! 2. What’s this? 3. Who’s your friend? 4. Sit down, please. 5. Nice to meet you. 6. Goodbye! 7. Let’s go. 8. How are you? 9. Are you Peter? 10. Sorry. | II A. That’s all right. B. Goodbye! C. I’m fine, thank you. D. Mike is. E. No, I’m not. F. Good afternoon! G. Thank you. H. OK. I. It’s an apple. J. Nice to meet you, too. |