下图是用不同浓度的生长素类似物处理某种植物插条生根的实验结果，其中能反映出促进生根效果最好的是[ ]
A．
B．
C．
D．
答案：C
– Why do you _______ the radio?
– I’m afraid of waking up the baby.
A. turn up B. turn on C. turn down
---Why did you refuse to join them in the show?
---Because I don’t think the show is worth ________ part in.
A．take
B．to taking
C．taking
D．to take
