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【题目】用括号所给词的适当形式填空

We are _______(use) to the idea of _______(age) in ourselves. We are so used to this that it makes us _______(surprise) to find that there may be some animals that do not age. Sea anemones(海葵)are an example. _______(keep) for nearly a century, some of them don't show any signs of lifelessness. Some kinds of sea worms can even grow back-wards. If _______(keep) in the dark and given nothing _______(eat), they get' steadily smaller.hey finally end as a ball of cells _______(look)rather like the egg from which they came. Under _______(give) conditions, the ball will turn back to a worm and start _______( grow) again, One could probably keep them _______(grow) and un-growing again and again.

【答案】见解析

【解析】used, aging, surprised, Kept, kept, to eat, looking, given, growing,

Growing

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