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  3. We are used to the idea of aging in ourselves. We are so used to this that it comes as a surprise to find that there may be some

We are used to the idea of aging in ourselves. We are so used to this that it comes as a surprise to find that there may be some

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问题    We are used to the idea of aging in ourselves. We are so used to this that it comes as a surprise to find that there may be some animals that do not age.
   Sea anemones (海葵) are an example. Some have been kept for nearly a century without showing any signs of lifelessness. Some kinds of sea worms can even " grow backwards. " If kept in the dark and given nothing to eat, they get steadily smaller. They finally end as a ball of cells looking rather like the egg from which they came. Under good conditions the ball will turn back to a worm and start growing again. One could probably keep them growing and un-growing again and again.  
According to the passage, some sea animals_______.
选项 A、will die when they become a ball of cells
B、do not grow old
C、will die without food
D、will stop growing any time they want
答案B
解析 从文章第一段最后“there may be some animals that do not age”可知有些海洋动物不会变老。因此选B。
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