有黑、蓝、红三枝颜色的笔和白、绿两块橡皮，任意拿出一枝笔和一块橡皮，则取到红笔、蓝橡皮的概率是（ ）。
0
The Yellow River is _____ the Pearl River.
A twice long as B twice as long as
C as twice longer as D as long twice as
1、相同质量的0℃的水与0℃的冰相比较（ ）
A．它们的分子平均动能相等
B．水的分子势能比冰的分子势能大
C．水的分子势能比冰的分子势能小
D．水的内能比冰的内能多
