米雪的特征是白色不透明,球形小颗粒,固态降水,着地不反跳。
参考答案:错
如果a+b=8,ab=1那么a2-b2=( )
—______ ?
—No, it isn't. [ ]
A.What's this
B. It is on the chair
C. Is that a mouse
D. Where is it