阅读理解。根据短文内容，从下框的A---F选项中选出能概括每一段

问题阅读理解

阅读理解。
根据短文内容，从下框的A---F选项中选出能概括每一段主题的最佳选项。选项中有一项为多余选项。

A. The absorbing nourishment
   (营养) of cells
B. Each organ of body can work
   individually
C. The excreting (排泄) and cleaning
of cells
D. The regeneration of cells
E. The cell living in a community
   of cells
F. The  cause of illnesses

1. (      )
     Each cell is a little body living on its own. It moves, digests, grows, excretes (排泄) and reproduces. But,
living as it does in a community of cells, it is not independent at all. The specialized cells of the body are
dependent on each other for such things as nourishment and the removal of their waste matter. For example,
if the digestive cells of the food canal do not perform their function properly, the muscle cells will not receive
nourishment, or if the excreting cells don't take away poisonous waste, the cells of the body will be poisoned
and die. Some cells of the body move, but not many. It is not necessary for the majority to move.
2. (      )
     All the cells of the body need food. They receive their food from a fluid called lymph (淋巴), which
permeates all the tissues and bathes the individual cells. The lymph circulates through the tissues, carrying food
obtained into the food canal, the intestines (肠子).
3. (      )
     All cells excrete waste matter. When the food has been used, the waste matter which the cells don't require
is passed into the circulating lymph and thus carried away. It is taken to the cells of the organs which are
specialized for removing waste matter from the body.
4. (      )
     All the cells reproduce their own kind and grow. In performing their work cells become tired, worn out and
die. If the tissue of the organ is to maintain its health, new cells are required to replace the old ones. The
healthy cells accomplish this by splitting their bodies, so that one cell becomes two cells and the two cells four
and so on. These cells are young and small, but still carry on the function of the organ.
5. (     )
     It is plain, therefore, that each organ of the body must perform its work well if the other organs are to
maintain their health. When they are all functioning well, the body is healthy. The individual is vigorous
(强健的) and free from discomfort of any kind. When any organ fails to do its work, all the organs are liable
to become affected; changes take place in their cells and their functions are disordered. Such changes give
rise to sensations of sickness, pain, loss of strength, bad appetite, fever, and so on. The body is said to be
diseased.

答案

1-5: EACDF