Hi, I'm Lisa. Look at the picture of my family. There are four people in my family. We live in Russia. Next month, we are going to travel around China. We are going to stay for ten days. We are going to the Summer Palace, the Great Wall and Wangfujing Street. They are all in Beijing. I hope we have fun time.

一平面线圈用细杆悬于P点，开始时细杆处于水平位置，释放后让它在如图所示的匀强磁场中运动．已知线圈平面始终与纸面垂直，当线圈第一次通过位置B和位置C的过程中，下列对磁通量变化判断正确的是（   ）

细胞的有丝分裂和减数分裂过程中都发生的现象是（    ）

①染色体复制一次    ②非姐妹染色单体之间发生互换      ③纺锤丝牵引染色体运动 

④细胞分裂两次      ⑤着丝点分裂、姐妹染色单体分开    ⑥同源染色体的联会和分离．

下列哪一种物质不能在生物体内分解释放出能量（  ）