题干
Can you tell me ___________________? You look upset.
A：what the matter i
B：what matter it i
C：what is the matter
D：what was the matter
答案(点此获取答案解析）
C
一淀粉酶的产生，促进种子萌发；6一甲基嘌呤是mRNA合成的抑制剂。分别用三组淡剂对种子进行处理：①赤霉素；②赤霉素和脱落酸；③赤霉素和6一甲基嘌呤(6一甲基嘌呤在第1l小时加入，见图中“↓”)。结果如图所示，下列说法不正确的是（ ）