题目内容：
Paragraph 2_______
A．What exactly is science? B．How do you find an explanation?
C．What topics do you need?
D．How do you answer your child's questions?
E．Where does your child study science?
F．How do you set up the experiment on salt and water?
参考答案：【答案仅供学习，请勿对照自行用药等】
答案解析：