— Would you like to go for a picnic with me?
— ______ I have to help Kate with her Chinese
A：That's right.
B：I'm sorry I can't.
C：No problem.
D：See you.
设NA为阿伏加德罗常数的数值．下列说法正确的是（ ）
比一比，再组词
棵____ 助____ 拔____
课____ 协____ 泼____
设NA代表阿伏加德罗常数的数值，下列说法正确的是（ ）
