选择合适的单词补全对话。
come，bad，weather，back，cool |
A：Hey, Dad! Are you outside?
B：Yes, I am．
A：What's the____like outside?
B：It's____．
A：What are you doing?
B：I'm playing soccer with your dog．
A：That's not____．
B：Sure! Well, it's time for you to call your grandma．
A：Yes．I'm calling Grandma____．But Grandma also wants to speak to you．
B：I see．I'm____right now．
定范围内细胞膜外某物质浓度变化与该物质进入细胞膜内速度的关系，下列关于该物质的说法，正确的是 （ ）