A：格里菲思实验中肺炎双球菌R型转化为S型是基因突变的结果
B：艾弗里实验证明了DNA是肺炎双球菌的遗传物质
C：赫尔希和蔡斯实验中用含32P的培养基培养T2噬菌体
D：赫尔希和蔡斯实验证明了蛋白质不是T2噬菌体的遗传物质
在孟德尔豌豆杂交实验中，若n代表等位基因对数（独立遗传），则2n代表（ ）
①F1形成配子的基因型种类数 ②F1形成F2时雌、雄配子的结合方式
③F2的基因型种类数 ④F2的表现型种类数．
Time now
It's ____ in the morning.
Weather information
Snow has been falling since yesterday.
Suggested ways of transportation(交通工具)
____.
Influence to the school
Some schools in the countryside are ____
More information about the weather
____ will last for at least two more days.
Time for the next ____.
In two hours
