题目

Will it matter if you don't take your breakfast? Recently a test was given in the United States. Those tested included people of different ages, from 12 to 83. During the experiment, these people were given all kinds of breakfast, and sometimes they got no breakfast at all. Special tests were set up to see how well their bodies worked when they had eaten a certain kind of breakfast. The results show that if a person eats a proper breakfast, he or she will work with better effort than if he or she has no breakfast. This fact appears to be especially true if a person works with his brains. If a 若把变形虫的核从其体内取出，则变形虫应表现出        (     ) A．失去核的变形虫，虽停止伸出伪足，但在几天后核就再生，能正常活动 B．失去核的变形虫，细胞质功能逐渐衰退，几天内将死亡 C．失去核的变形虫，虽然反复进行数次分裂，但结果还是死亡 D．除去核以后，细胞质活动反而暂时提高，因此细胞分裂变得更加旺盛