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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(细胞)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 ungrowing 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 推理判断题。由文中可知，一些海洋生物不会变老，因为它们可以使自己一次又一次地生长。故选B。
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