有关生态系统的叙述中，正确的是（  ）

有人从某种哺乳动物体内提取出一种成熟细胞。经化学分析，细胞中不含有DNA 而含有红色含铁的蛋白质，下列生理活动最可能发生在该细胞中的是（   ）

    Now a hot topic____(discuss) about whether the old computers in our school should be replaced____new ones. With the rapid____ ( develop) of science and technology, there is no doubt ____our old computers are totally out of date. The headmaster as well as the teachers and students____(be) not satisfied with the slow working speed of the computers. Therefore, all of them request to have a new computer so that their problems can be solved ____ （success).____the school should consider is ____to deal with the old computers wisely. Personally speaking,____(throw)  them away to the place____they are regarded as rubbish is not a good idea.