A：催化剂能降低反应的活化能，使单位体积内活化分子百分数大大增加
B：增大反应物的浓度，可使单位体积内活化分子增多，反应速率加快
C：对于有气体参加的反应通过压缩容器增大压强，可使单位体积内活化分子增多，反应速率加快
D：活化分子之间的碰撞一定是有效碰撞
阅读短文，选择正确的答案。
I am seven. I go to school every day. Classes start at eight o'clock. In the morning. I have Chinese, Art and Maths. I have English and P.E. in the afternoon. I get home at half past four. I watch TV at home. I have a good friend, Xiaotian. He sleeps at school. He goes to bed at nine. I go to bed at half past nine.
三峡工程在宜昌。三峡电站2009年发电798.5亿千瓦时，数据798.5亿用科学记数法表示为（ ）
